锘??xml version="1.0" encoding="utf-8" standalone="yes"?>国产尤物精品,国产精品视频导航,亚洲欧洲精品一区二区三区不卡 http://www.shnenglu.com/sixleaves/category/20815.html閲嶅墤鏃犻攱 澶у閥涓嶅伐zh-cnSun, 10 May 2015 23:59:32 GMTSun, 10 May 2015 23:59:32 GMT60Ruby-EX1椴佹瘮鍏ラ棬http://www.shnenglu.com/sixleaves/archive/2015/05/02/210513.htmlswpswpFri, 01 May 2015 17:16:00 GMThttp://www.shnenglu.com/sixleaves/archive/2015/05/02/210513.htmlhttp://www.shnenglu.com/sixleaves/comments/210513.htmlhttp://www.shnenglu.com/sixleaves/archive/2015/05/02/210513.html#Feedback0http://www.shnenglu.com/sixleaves/comments/commentRss/210513.htmlhttp://www.shnenglu.com/sixleaves/services/trackbacks/210513.html闃呰鍏ㄦ枃

swp 2015-05-02 01:16 鍙戣〃璇勮
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C++闈㈠悜瀵硅薄鎬葷粨錛堜竴錛?/title><link>http://www.shnenglu.com/sixleaves/archive/2014/09/04/208230.html</link><dc:creator>swp</dc:creator><author>swp</author><pubDate>Thu, 04 Sep 2014 09:18:00 GMT</pubDate><guid>http://www.shnenglu.com/sixleaves/archive/2014/09/04/208230.html</guid><wfw:comment>http://www.shnenglu.com/sixleaves/comments/208230.html</wfw:comment><comments>http://www.shnenglu.com/sixleaves/archive/2014/09/04/208230.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.shnenglu.com/sixleaves/comments/commentRss/208230.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/sixleaves/services/trackbacks/208230.html</trackback:ping><description><![CDATA[<p><strong><font size="3">1.鍒涘緩瀵硅薄錛?/font></strong></p> <p><strong><font size="3">     鍦╦ava涓垱寤哄璞″彧鑳界敤new鎵嶈錛岃繑鍥炵殑鏄紩鐢ㄧ被鍨嬶紝鎵浠ュ璞″悕鍏跺疄鏄紩鐢ㄣ傝孋++涓殑瀵硅薄鍒涘緩涓嶄竴鏍鳳紝C++鍙互鐢ㄦ寚閽堝瓨瀵硅薄錛岀浉褰撲簬寮曠敤銆備篃鍙互鐩存帴鐢ㄧ被鏍囪瘑絎︽潵鍒涘緩瀵硅薄銆傚Person鏄被錛孭erson a,b錛涘湪C++涓氨鍒涘緩浜嗕袱涓璞★紝鍦╦ava涓槸Person瀵硅薄鐨勫紩鐢ㄣ?/font></strong></p> <p><strong><font size="3">2.C++涓簡this鎸囬拡錛?/font></strong></p> <p><strong><font size="3">     C++涓殑this鎸囬拡鍜宩ava涓殑涓鏍楓傚湪C++涓紝this鎸囬拡鎸囧悜褰撳墠瀵硅薄錛宼his鎸囬拡闅愬惈鍦ㄦ瘡涓垚鍛樺嚱鏁頒箣涓紝鍏剁被鍨嬫槸class className *.</font></strong></p> <p><strong><font size="3">     鍐呴儴鏈哄埗錛?/font></strong></p> <p><strong><font size="3">     鍦–++涓闂暟鎹垚鍛橀兘鏄殣鍚殑浣跨敤this鎸囬拡鎿嶄綔鐨勩傞渶瑕佹敞鎰忕殑鏄?/font></strong></p> <p><strong><font size="3">     1.this鎸囬拡鏄痗onst綾誨瀷錛屼笉鍙敼鍙樸?/font></strong></p> <p><strong><font size="3">     2.this鎸囬拡閽堝瀵硅薄錛屾墍浠ラ潤鎬佹垚鍛樻槸娌℃湁this鎸囬拡鐨勩?/font></strong></p> <p><strong><font size="3">3.鏋勯犲嚱鏁板拰鏋愭瀯鍑芥暟</font></strong></p> <p><strong><font size="3">     鏋勯犲嚱鏁板氨涓嶈浜嗭紝鍙涓嬮粯璁ゆ瀯閫犲嚱鏁板氨姝籧lassName() {},榛樿浼氱敓鎴愩備絾鏄鏋滀綘鑷繁瀹氫箟浜嗘瀯閫犲嚱鏁幫紝鑰屼笖涓嶆槸瀹氫箟鎴愰粯璁ゆ瀯閫犲嚱鏁幫紝灝辮鍦ㄥ畾涔変竴涓嬮粯璁ゆ瀯閫犲嚱鏁幫紝涓嶇劧鍒涘緩瀵硅薄鏃跺欏繀欏繪寚瀹氬弬鏁幫紝涓嶈兘鐢ㄦ棤鍙傛暟鐨勩?/font></strong></p> <p><strong><font size="3">     鏋愭瀯鍑芥暟錛屽氨鏄敤鏉ュ湪瀵硅薄瑕侀攢姣佹椂鍊欙紝鍥炴敹涓浜涘璞¤嚜宸卞悜緋葷粺鐢寵鐨勫唴瀛樸傛瀽鏋勫嚱鏁拌皟鐢ㄥ畬鍚庯紝緋葷粺鎵嶆竻闄ゅ璞℃湰韜崰鎹殑鍐呭瓨銆?/font></strong></p> <p><strong><font size="3">      Tips錛?/font></strong></p> <p><strong><font size="3">       1.鏋愭瀯鍑芥暟涓嶈兘閲嶈澆錛屽彧鏈変竴縐嶅艦寮弤className() {},榪欐槸鍜屾瀯閫犲嚱鏁扮殑鍖哄埆</font></strong></p> <p><strong><font size="3">       2.涓夌鎯呭喌涓嬭皟鐢ㄦ瀽鏋勫嚱鏁幫紝瀵硅薄紱誨紑灞閮ㄤ綔鐢ㄥ煙鍚庯紝鎾ら攢瀵硅薄瑙﹀彂錛岀▼搴忕粓姝紝瑙﹀彂錛沝elete榪愮畻絎﹀洖鏀秐ew鍒涘緩鐨勫璞¤Е鍙戯紱涓存椂鍖垮悕鍑芥暟浣跨敤瀹屾瘯錛?/font></strong></p> <p><strong><font size="3">4.鎷瘋礉鏋勯犲嚱鏁板拰鍗曞弬鏋勯犲嚱鏁?/font></strong></p> <p><strong><font size="3">        錛?錛夋嫹璐濇瀯閫犲嚱鏁幫紝鍏跺疄灝辨槸鏋勯犲嚱鏁頒腑鐨勫崟鍙傛暟褰㈠紡鐨勬瀯閫犲嚱鏁幫紝鍙槸鍏跺弬鏁版瘮杈冪壒鍒紝鏄鑷韓鍚岀被瀵硅薄鐨勫紩鐢ㄣ傛嫹璐濇瀯閫犲嚱鏁板湪涓涓嬪嚑涓殑鏂逛細鐢ㄥ埌銆?/font></strong></p> <p><strong><font size="3">         Date a;Date b(a);//璋冪敤鐨勫氨鏄嫹璐濇瀯閫犲嚱鏁?/font></strong></p> <p><strong><font size="3">         Date b = a錛?/璋冪敤鐨勪篃鏄嫹璐濇瀯閫犲嚱鏁?/font></strong></p> <p><strong><font size="3">         function(Date d)锝?#8230;.锝濓紱function(a);//璋冪敤鐨勪篃鏄嫹璐濇瀯閫犲嚱鏁幫紙鍏堝垱寤篋ate綾葷殑鍖垮悕瀵硅薄錛岀劧鍚庤皟鐢ㄦ嫹璐濇瀯閫犲嚱鏁幫級</font></strong></p> <p><strong><font size="3">         Date c = function(a);//榪欒竟function榪斿洖Date瀵硅薄錛屼篃鏄皟鐢ㄦ嫹璐濇瀯閫犲嚱鏁幫紙娌℃湁鍒涘緩鍖垮悕瀵硅薄錛?/font></strong></p> <p><strong><font size="3">         錛?錛夊崟鍙傛瀯閫犲嚱鏁?/font></strong></p> <p><strong><font size="3">          鍗曞弬鏁版瀯閫犲嚱鏁般傚叾瀹炴嫹璐濇瀯閫犲嚱鏁頒篃鏄崟鍙傛瀯閫犲嚱鏁般備絾鏄垜灝嗕粬浠尯鍒紑鏉ワ紝涓昏鏄崟鍙傛瀯閫犲嚱鏁幫紝涓昏鏄敤鍦紝闅愬紡鐨勭被鍨嬭漿鎹笂銆?/font></strong></p> <p><strong><font size="3">          濡備綘瀹氫箟浜嗕竴涓狪nteger綾伙紝鐩存帴Integer a = 1錛涙槸浼氬嚭閿欑殑銆傚洜涓?涓嶈兘鑷姩鎴栬呴殣鍚殑杞崲鎴怚nteger瀵硅薄錛屾墍浠ヨ繖鏃跺欎綘灝辮瀹氫箟</font></strong></p> <p><strong><font size="3">          鍗曞弬鏁版瀯閫犲嚱鏁幫紝鐢ㄦ潵璁╄嚜鍔ㄨ漿鎹紝鍦╦ava涓О涓哄寘瑁呫傜敱浜庢槸鏋勯犲嚱鏁幫紝鍙傛暟涓殑綾誨瀷灝辨槸閭d釜瑕佽漿鎹㈢殑綾誨瀷銆傚叾瀹冨拰鍩烘湰鏋勯犲嚱鏁頒竴鏍楓?/font></strong></p> <p><strong><font size="3">5.闈欐佹垚鍛?/font></strong></p> <p><strong><font size="3">        闈欐佹垚鍛樺張鍒嗕負闈欐佹暟鎹垚鍛樺拰闈欐佸嚱鏁版垚鍛樸侰++涓殑闈欐佸嚱鏁版垚鍛樺拰java涔熸病鍖哄埆銆備富瑕佹槸闈欐佹暟鎹垚鍛樸傛墍浠ユ垜浠葷粨涓嬮潤鎬佹暟鎹垚鍛?/font></strong></p> <p><strong><font size="3">      錛?錛夐潤鎬佹暟鎹垚鍛樺拰綾誨叡瀛樹骸鑰屼笉鏄拰瀵硅薄銆?/font></strong></p> <p><strong><font size="3">      錛?錛夐潤鎬佹暟鎹垚鍛樺湪綾誨姞杞芥椂鍊欏垎閰嶇┖闂村茍榪涜鍒濆鍖栵紝鑰屼笉鏄湪瀵硅薄鍔犺澆鏃跺欍傛墍浠ラ潤鎬佹暟鎹垚鍛橀粯璁ゅ垵濮嬪寲涓?銆?/font></strong></p> <p><strong><font size="3">             閲嶇偣鏄細綾諱腑鐨勯潤鎬佹暟鎹垚鍛樼煡璇嗕竴浠藉0鏄庯紝蹇呴』鍦ㄧ被澶栭噸鏂板畾涔夊茍鍒濆鍖栭潤鎬佹暟鎹垚鍛樸?/font></strong></p> <p><strong><font size="3">      錛?錛夌被澶栭氳繃綾諱綔鐢ㄥ煙榪愮畻絎︼細錛氳闂潤鎬佹暟鎹垚鍛樸?/font></strong></p> <p><strong><font size="3">6.const鐢ㄦ硶</font></strong></p> <p><strong><font size="3">        錛?錛塩onst鎴愬憳鍑芥暟錛岃繖鏃跺檆onst鍔犺澆鍑芥暟鍚嶅悗闈?锝涳綕涔嬪墠銆傝〃紺哄嚱鏁頒笉浼氭敼鍙樺綋鍓嶅璞$殑鐘舵侊紝鑰屼笖鍙兘璋冪敤const鎴愬憳鍑芥暟銆傦紙鍏繪垚涔犳儻錛岃兘鍔犲敖閲忓姞錛?/font></strong></p> <p><strong><font size="3">               Tips錛氳繖閲宑onst涔熸槸鍑芥暟絳懼悕鐨勪竴閮ㄥ垎銆?/font></strong></p> <p><strong><font size="3">        錛?錛塩onst瀵硅薄錛岃〃紺哄父閲忓璞°?/font></strong></p> <p><strong><font size="3">        錛?錛塩onst褰㈠弬錛岃〃紺哄嚱鏁頒腑涓嶄細鏀瑰彉璇ュ艦鍙傘傛敞鎰忥細甯擱噺瀵硅薄錛屽彧鑳借皟鐢╟onst鎴愬憳鍑芥暟錛屽洜涓鴻繖鎵嶈兘淇濊瘉鐘舵佷笉琚敼鍙橈紝鍚屾椂榪欐牱淇濊瘉浜嗕粬灝辨槸甯擱噺瀵硅薄銆?/font></strong></p> <p><strong><font size="3">                Tips錛氳繖閲宑onst涔熸槸鍑芥暟絳懼悕鐨勪竴閮ㄥ垎銆?/font></strong></p> <p><strong><font size="3">         錛?錛塩onst榪斿洖鍊鹼紝璇存槑榪斿洖鍊兼槸涓嶅彲浠ユ敼鍙樼殑銆?/font></strong></p> <p><strong><font size="3">浠ヤ笂榪欎簺閮芥槸鎬葷粨錛屼笉鏄啓緇欐病鍩虹鐨勪漢鐪嬬殑銆傚彧鏄負浜嗘柟渚挎暣鐞嗗拰璁板繂銆?/font></strong></p><img src ="http://www.shnenglu.com/sixleaves/aggbug/208230.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/sixleaves/" target="_blank">swp</a> 2014-09-04 17:18 <a href="http://www.shnenglu.com/sixleaves/archive/2014/09/04/208230.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>榪愮畻絎﹂噸杞?鍙嬪師鍑芥暟(緇撴瀯浣撱佺被鍜岃繍綆楃閲嶈澆)http://www.shnenglu.com/sixleaves/archive/2014/08/29/208178.htmlswpswpFri, 29 Aug 2014 08:31:00 GMThttp://www.shnenglu.com/sixleaves/archive/2014/08/29/208178.htmlhttp://www.shnenglu.com/sixleaves/comments/208178.htmlhttp://www.shnenglu.com/sixleaves/archive/2014/08/29/208178.html#Feedback0http://www.shnenglu.com/sixleaves/comments/commentRss/208178.htmlhttp://www.shnenglu.com/sixleaves/services/trackbacks/208178.html鏈榪戝湪緇冧範綆楁硶銆佽寰楁湁蹇呰鎬葷粨涓婥++榪欐柟闈㈢殑鐭ヨ瘑錛孋++紜疄鏄鏉傦紝but i love it銆?/span>
絎竴錛氳繍綆楃閲嶈澆鐨勫熀鏈簲鐢ㄣ傜浜岋細榪愮畻絎﹂噸杞戒簬鍙嬪師鍑芥暟鐨勫叧緋匯傜涓夛細緇撴瀯浣撲簬綾誨叧浜庤繍綆楃閲嶈澆鐨勫尯鍒傞鍏堟垜闇瑕佹櫘鍙婁笅鍩烘湰鐨勭煡璇嗭細
棰勫鐭ヨ瘑錛?/span>operator(鎿嶄綔絎?銆乷perand(鎿嶄綔鏁?銆佽〃杈懼紡
琛ㄨ揪寮忔槸鐢辨搷浣滅鍜屾搷浣滄暟鏋勬垚鐨勶紝鑰屼笖涓鑸瘡涓〃杈懼紡閮芥湁鍓綔鐢紝騫朵笖閮芥湁緇撴灉錛堝叧娉ㄧ粨鏋滃拰鍓綔鐢級銆備粈涔堟剰鎬濓紵
鍏充簬鍓綔鐢ㄧ殑鐞嗚В錛氬叾瀹炲氨鏄湪杈懼埌緇撴灉鐨勮繖涓繃紼嬩腑鎵鍋氱殑涓浜涗簨鎯咃紝鑰岃繖浜涗簨鎯呬駭鐢熶簡涓浜涘獎鍝嶏紝浣嗘槸涓嶅獎鍝嶇粨鏋溿?/span>
濂藉儚鏈夌偣緇曘佺湅鐪嬩緥瀛愬湪鐞嗚В鍚с?/span>
鐪嬩緥瀛愶細
int a = 1,b=2,c; c = a + b;
鍦ㄨ繖孌典唬鐮侀噷闈紝c = a + b;灝辨槸琛ㄨ揪寮忋佸叾涓?= 銆?+ 鍙堢О涓烘搷浣滅銆乧銆乤銆乥鍙堢О涓烘搷浣滄暟銆傚叾緇撴灉灝辨槸璁$畻鍑轟簡a+b鐨勫鹼紝鍓綔鐢ㄦ病鏈夈?/span>
鍙堟瘮濡傦細
cout << "Helloe" << endl;鍏朵腑 <<鏄搷浣滅銆乧out銆?helloe"銆乪ndl鏄搷浣滄暟銆?lt;<鐨勭粨鏋滄槸榪斿洖浜唎stream鐨勫紩鐢紝鑰屽壇浣滅敤灝辨槸灝?Helloe"杈撳嚭鍒板睆騫曘?/span>

絎竴錛氳繍綆楃閲嶈澆鐨勫熀鏈簲鐢ㄣ?/strong>
鐪嬪涓嬩唬鐮侊細
 1 #include <iostream>
 2 
 3 using namespace std;
 4 
 5 class Point {
 6 private:
 7     double x,y;
 8 public:
 9     Point(double x = 0, double y = 0):x(x),y(y) {
10         
11     }
12     Point operator+(const Point &p) const{//榪欑鏄渶鍩烘湰鐨勬柟寮忋佸叾鏈川鏄仛鎿嶄綔鏁拌皟鐢╫perator+鍑芥暟 
13         Point temp;
14         temp.x = this->x + p.x; 
15         temp.y = this->y + p.y;
16         return temp;
17     }
18     /*
19     ostream& operator<<(ostream& out) {
20         out << x << " " << y;
21         return out;
22     }
23     */
24     friend ostream& operator<<(ostream& out, Point & p);   
25 };
26 ///*
27 ostream& operator<<(ostream& out, Point & p) {
28     out << p.x <<" "<< p.y;
29     return out;
30 }
31 //*/
32 
33 int main() {
34     
35     Point a(1,5);
36     Point b(5,7);
37     Point c;
38     c = a + b;
39     //c << cout << endl;
40     cout << c << endl; 
41     return 0;
42 }
濡備笂浠g爜錛?/span>
娉ㄩ噴鎺夌殑鍏堜笉鐢ㄧ湅錛?2--17琛屽氨鏄渶鍩烘湰鐨勮繍綆楃閲嶈澆銆佸叾璋冪敤鍦?8琛岋紝鏈川鏄細c = a.operator+(b);涔熷氨鏄皟鐢ㄥ仛鎿嶄綔鏁扮殑鏂規硶閭d箞榪樿鍙嬪厓鍑芥暟騫蹭粈涔堝憿錛熻冭檻涓嬭緭鍑猴紝濡傛灉浣犳兂璁ヽout瀵硅薄鑳借嚜鍔ㄨ緭鍑篜oint鐨勫璞″浣曞崐鍒般備綘寰堣仾鏄庝竴瀹氭兂鍒伴噸杞?lt;<榪愮畻絎︺亂es錛乺ight錛佷簬鏄妸operator<<浣滀負鎴愬憳鍑芥暟錛屼綘鍙兘鍐欐垚涓婇潰娉ㄩ噴鎺夌殑鍝牱錛岄偅涔堣皟鐢ㄦ椂錛岄夯鐑﹀氨鏉ヤ簡銆佺紪紼?9琛岀殑鏍峰瓙銆傚凹鐜涗斧銆佺湡瀹炲彉鎬併佹垜鏄兂璁╁畠鏄痗out << c << endl銆傛悶寰楀洓涓嶅儚浜嗐傛槸鐨勫氨鏄洜涓鴻繖鏍峰瓙涓嶅ソ鐢紝鎵浠ユ垜浠緇撳悎鍙嬪厓鍑芥暟鐨勬妧鏈拰榪愮畻閲嶈澆鎶鏈潵瀹炵幇40琛岀殑璋冪敤銆傚ソ浜嗛噸鐐規潵浜嗭紒璋ㄨ涔嬶紒
tips:瀵逛簬闈炴垚鍛樺嚱鏁扮殑榪愮畻絎﹂噸杞斤紝絎竴涓弬鏁板氨鏄乏鎿嶄綔鏁幫紝絎簩涓搷浣滄暟灝辨槸鍙蟲搷浣滄暟銆?/span>
絎簩錛?/span>榪愮畻絎﹂噸杞藉拰鍙嬪師鍑芥暟鐨勫叧緋?/span>
鎵浠ヤ笂闈㈢殑鍙嬪厓鍑芥暟鐨勫弬鏁伴『搴忔槸cout瀵硅薄鐨勫紩鐢ㄦ槸絎竴涓弬鏁般丳oint瀵硅薄寮曠敤涓虹浜屼釜鍙傛暟銆?/span>
鎴戜滑榪樿瑙e喅絎簩涓棶棰橈紝濡備綍璁╄繖涓嚱鏁拌闂甈oint瀵硅薄鐨勭鏈夐儴鍒嗭紝鍙鍦≒oint綾諱腑澹版槑錛宧ello鎴戞槸浣犵殑鏈嬪弸鍟︺佷粬鐨勪笢瑗垮氨鏄綘鐨勫暒銆佷綘瑕佹庝箞鐢ㄦ庝箞鐢紝榪欐墠鏄湅鍙嬩箞錛佷笉銆佹槸鍩哄弸錛佹垜璁や負搴旇鍙仛鍩哄弸鍑芥暟錛屽搱鍝堛傚0鏄庢牸寮忓氨鏄姞涓奻riend鍜屽嚱鏁扮殑澹版槑鍗沖彲銆?/span>
tips:鎴愬憳鍑芥暟鍜岄潪鎴愬憳鍑芥暟鐨勮繍綆楃閲嶈澆鐨勫尯鍒氨鏄紝鍙傛暟涓暟涓嶄竴鏍楓傛垚鍛樺嚱鏁頒腑鐨勫乏鎿嶄綔鏁頒笉鐢ㄤ綋鐜板嚭鏉ワ紙鐢╰his鍗沖彲錛夈佽岄潪鎴愬憳鍑芥暟鐨勫乏鍙蟲搷浣滄暟閮借浣撶幇鍦ㄨ繍綆楃鍑芥暟鍙傛暟閲岄潰銆?/span>
絎笁錛?/strong>緇撴瀯浣撳拰綾誨叧浜庤繍綆楃閲嶈澆鐨勫尯鍒?/strong>
鍏充簬鍖哄埆錛屽叾瀹炲彧鏈変竴涓紝鍥犱負緇撴瀯浣撻粯璁ょ殑鏉冮檺鏄痯ublic銆佸嵆鍏舵垚鍛樺澶栫晫閮芥槸鍙鐨勶紝鎵浠ュ叾涓嶉渶瑕佸弸鍏冨嚱鏁版潵鏀寔錛屼絾鏄叾榪樻槸闇瑕佺敤闈炴垚鍛樺嚱鏁版潵閲嶈澆<<姣旇緝鏂逛究銆佽屼笉鏄敤鎴愬憳鍑芥暟鏉ラ噸杞?lt;<.鍘熷洜涓婇潰宸茬粡璇磋繃浜嗐傛敞鎰忚繖涓師鍥犱笉鏄弸鍏冭繖欏規妧鏈綋鐜板嚭鏉ョ殑錛岃屾槸鎴愬憳鍑芥暟鍜岄潪鎴愬憳鍑芥暟浣撶幇鍑烘潵鐨勶紝鍙嬪厓鎶鏈煡璇嗙敤鏉ユ敮鎾戝叾鍦ㄧ被涓殑搴旂敤銆傘?br />tips:瀵逛簬緇撴瀯浣擄紝闈炴垚鍛樺嚱鏁扮殑榪愮畻絎﹂噸杞芥柟娉曪紝涓嶉渶瑕佸0鏄庝負鍙嬪厓鍑芥暟銆?/span>
濡備笅浠g爜錛?/span>
 1 #include <iostream>
 2 
 3 using namespace std;
 4 
 5 struct Point{
 6     double x,y;
 7     Point(double x = 0, double y = 0):x(x),y(y) {
 8         
 9     }
10     Point operator+(const Point &p) const{//榪欑鏄渶鍩烘湰鐨勬柟寮忋佸叾鏈川鏄仛鎿嶄綔鏁拌皟鐢╫perator+鍑芥暟 
11         Point temp;
12         temp.x = this->x + p.x; 
13         temp.y = this->y + p.y;
14         return temp;
15     }
16 };
17 
18 ostream& operator<<(ostream& out, Point & p) { 
19     out << p.x <<" "<< p.y;
20     return out;
21 }
22 
23 
24 int main() {
25     
26     Point a(1,5);
27     Point b(5,7);
28     Point c;
29     c = a + b;
30     cout << c << endl; 
31     return 0;
32 }


swp 2014-08-29 16:31 鍙戣〃璇勮
]]>
娣卞叆鎺㈣鍑芥暟鎸囬拡http://www.shnenglu.com/sixleaves/archive/2014/07/26/207814.htmlswpswpSat, 26 Jul 2014 10:08:00 GMThttp://www.shnenglu.com/sixleaves/archive/2014/07/26/207814.htmlhttp://www.shnenglu.com/sixleaves/comments/207814.htmlhttp://www.shnenglu.com/sixleaves/archive/2014/07/26/207814.html#Feedback5http://www.shnenglu.com/sixleaves/comments/commentRss/207814.htmlhttp://www.shnenglu.com/sixleaves/services/trackbacks/207814.html鍑芥暟鎸囬拡鏄竴涓噸闅劇偣錛岀湅瀹屼功鏈悗錛屽喅瀹氬啓綃囪嚜宸卞仛涓嬫葷粨銆?/span>
棣栧厛鍦–++\C涓紝鍑芥暟鐨勫嚱鏁板悕鏈韓灝辨槸鍦板潃錛岃屽嚱鏁版寚閽堝氨鏄瓨鍌ㄨ繖涓湴鍧鐨勫彉閲忋?/span>
濡備笅浠g爜void fun(int a, int b) {.....}錛涘嚱鏁幫紝鍏秄un灝辨槸涓涓寚閽堬紝涔熷氨鏄瓨鐨勬槸鍦板潃錛?/span>
鑰寁oid (*p)(int, int) = fun錛涘氨鏄寚鍚戣繖涓嚱鏁扮殑鎸囬拡錛屽叾瀹炶鏉鍑芥暟鎸囬拡榪欐椂涔熶嬌鎸?/span>
鍚戣繖涓嚱鏁扮殑錛屾墍浠ヨ浣跨敤榪欎釜鍑芥暟鐨勮瘽錛岀悊璁轟笂搴旇鍐欐垚(*p)(2, 3);榪欑褰㈠紡錛屼絾鏄疄
闄呬笂錛岄氳繃p(2, 3)涔熷彲浠ユ垚鍔熻皟鐢紝鎵浠ユ垜浠彲浠ユ妸鍑芥暟鎸囬拡鍦ㄦ煇縐嶆儏鍐典笅褰撴垚鍑芥暟鐨勫埆
鍚嶏紝铏界劧榪欐牱涓嶇鍚堥昏緫錛屽綋鐒訛紝濡傛灉浣犳瘮杈冭緝鐪燂紝鍙互浣跨敤(*p)(2, 3);榪欒竟璁蹭簡榪欎箞澶?/span>
鐜板湪鏉ユ葷粨涓嬪浣曞0鏄庝竴涓壒瀹氱被鍨嬬殑鍑芥暟鎸囬拡鍚с?/span>
鐭ヨ瘑鐐?:
澹版槑鐗瑰畾綾誨瀷鐨勫嚱鏁版寚閽?
     1.鍏堝啓鍑鴻澹版槑鐨勬寚瀹氬嚱鏁扮殑鍘熷瀷prototype銆傚void fun(int , int );
     2.鎶妏rototype涓殑鍑芥暟鍚嶆浛鎹㈡垚(*p)錛屽void (*p)(int , int );
緇忚繃涓婇潰涓ゆ錛屼綘灝卞0鏄庝簡涓涓寚鍚戞棤榪斿洖鍊鹼紝甯︽湁涓や釜int綾誨瀷鐨勫嚱鏁扮殑鍑芥暟鎸囬拡p銆?/span>
鍝囷紝鍘熸潵鍑芥暟鎸囬拡榪欎箞綆鍗曞晩銆佽皝璇存寚閽堝緢澶嶆潅鐨勶紝璋佽鎸囬拡寰堥毦鐨勶紝鎷夊嚭鍘繪柀浜嗐佹楠楁垜浠辜灝忕殑蹇冪伒銆?/span>
姝ゆ椂浣犲彲鑳戒細闂紝鎬庝箞璋冪敤鍟婏紝鎬庝箞璋冪敤鍟婏紝棣栧厛浣犺緇欎粬璧嬪鹼紝鍏舵錛岃皟鐢ㄥ垎涓ょ錛屽氨鏄笂闈竴寮濮嬭
鐨勯偅涓ょ銆傝鐧戒簡錛屼篃灝辨槸瀵逛簬鍑芥暟鎸囬拡璋冪敤鍑芥暟錛屼綘鍙互瑙e紩鐢紝鍙互鍒葷洿鎺ョ敤鍦板潃銆?/span>

鐭ヨ瘑鐐?:
澹版槑鐗瑰畾綾誨瀷鐨勫嚱鏁版寚閽堟暟緇?
    1.鍜岀煡璇嗙偣涓1,2姝ヤ竴鏍?鎴戜滑鍏堝啓鍑轟竴涓傜浜屾鍦ㄦ兂鍔炴硶鍐欐垚涓涓暟緇?br />    2.鎶?*p)鏇挎崲鎴?*p[3])榪欐牱p灝辨槸涓涓寘鍚?涓嚱鏁版寚閽堢殑鏁扮粍銆備篃灝辨槸璇磒鏄嚱鏁版寚閽堢殑鎸囬拡錛?/span>
浠涔堟剰鎬濓紒浠涔堝彨鍋氭寚閽堢殑鎸囬拡錛屼綘鍦ㄨ浠涔堬紒錛屽搱鍝堟湁寰椾漢鐪嬪埌榪欏紑濮嬫檿浜嗭紝閭d箞鍚庨潰鐨勪綘鏇存檿錛屽叾瀹炶鐧戒簡p鏄寚鍚戞暟緇勭殑絎竴涓厓绱?br />
涔熷氨鏄p鐨勫湴鍧鍊兼槸絎竴涓厓绱犵殑鍦板潃錛屾墍浠ヨp鏄嚱鏁版寚閽堢殑鎸囬拡鍟婏紝鍥犱負p鎸囧悜鐨勬椂鍑芥暟鎸囬拡錛屽嚱鏁版寚閽堟寚鍚戠殑鎵嶆槸鍐呭瓨涓嚱鏁版寚浠ゅ尯鍩熺殑閭d釜鍧?

鐭ヨ瘑鐐?:
瀵逛簬鏁扮粍p[n]鍖哄埆錛宲鍜?amp;p鐨勯噸澶у尯鍒?
鍓嶈█錛氭垜浠煡閬損鎸囧悜鏁扮粍鐨勭涓涓厓绱狅紝鎵浠絳変環浜?amp;p[0]錛屾墍浠ユ垜浠彲浠ヨ交鏄撶湅鍑哄尯鍒簡錛宲鍜?amp;p
        鐨勭浉鍚岀偣鏄湪鏁板瓧涓婏紝浠栦滑鐩稿悓錛屼絾鏄湪澶у皬涓婏紝鎴栬呰綾誨瀷涓婏紝浠栦滑涓嶅悓錛?amp;p鎸囧悜鐨勬椂鏁翠釜鏁?br />        緇勶紝濡傛灉&p + 1鍒欒法瓚婄殑鏃舵暣涓暟緇勩傚叾瀹炴垜浠彲浠ヤ粠鎸囬拡瀹氫箟鐨勮繍綆楁潵鐞嗚В錛屾垜浠煡閬擄紝鎸囬拡
        鐨勫姞鍔狅紝鏈川涓婃槸鍦板潃鐨勮法瓚婏紝鑰岃法瓚婄殑闀垮害錛屽彇鍐充簬鍦板潃鐨勭被鍨嬶紝&p鏄寚鍚戞暟緇勭殑鎸囬拡錛屾墍浠?br />        鍏惰法瓚婄殑闀垮害錛岃偗瀹氭槸涓鏁翠釜鏁扮粍錛岃宲鎸囧悜鐨勬椂鏁扮粍涓緱絎竴涓厓绱狅紝鎵浠 + 1錛岃法瓚婄殑鏃舵暟
        緇勭殑涓涓厓绱犮?/span>
1.p鍜?amp;p鐨勭浉鍚岀偣錛屽湪浜庢暟鍊間笂錛屼粬浠兘鏄偅涓唴瀛樺潡鐨勫湴鍧錛岃岄偅涓唴瀛樺潡鐢ㄤ竴涓湴鍧鏍囧織錛屾墍浠ヤ粬浠殑鏁板瓧鐩稿悓銆?br />2.p鍜?amp;p鐨勫尯鍒湪浜庣被鍨嬩笂錛宲鏄寚鍚戜竴涓厓绱犵殑錛?amp;p鏄寚鍚戜竴涓暟緇勭殑錛屾墍浠 + 1鍜?amp;p + 1鏈夊崄鍒嗗ぇ寰楀尯鍒?/span>

鐭ヨ瘑鐐?:
闂:
鍋囪鏈?/span>const double * (*pa[3])(const double * , int ) = {f1, f2, f3}錛?/span>澹版槑鎸囧悜璇ュ嚱鏁版寚閽堟暟緇勭殑鎸囬拡銆?br />
鏈変簡鐭ヨ瘑鐐?錛岀悊瑙g煡璇嗙偣4灝卞崄鍒嗗鏄撲簡銆?/span>
      1.C11鏂規硶auto pc = &pa;  C11鐨勬柟寮忓崄鍒嗙畝鍗曟柟渚夸絾鏄浜庝笉鏀寔C11鐨勮鐪嬬浜屼釜錛屾渶鍘熷鐨勬柟娉?br />      2.鍒嗘瀽:鍥犱負鎴戜滑瑕佸0鏄庣殑鏃朵竴涓寚閽堬紝鑰屼笉鏄竴涓暟緇勬墍浠ラ鍏堢敤(*pd)鎶婂叾鎵╄搗鏉ワ紝鐒跺悗鍏舵槸鎸囧悜涓涓嚱鏁版寚閽堟暟緇勶紝榪欎釜鏁扮粍鏈?涓厓绱犮傛墍浠ュ叾鏍稿績閮ㄥ垎灝辨槸(*pd)[3],姝ゆ椂鐨勬剰鎬濆氨鏄墍pd鏄竴涓寚閽堬紝鍏舵寚鍚戝寘鍚?涓厓绱犵殑鏁扮粍
鎵浠ョ涓夋鎴戜滑瑕佽鏄庯紝鏁扮粍鍏冪礌鐨勭被鍨嬩簡錛岀被鍨嬪氨鏄痗onst double * (*)(const double *, int),涔熷氨鏄?/span>const double * (* (*pd)[3])(const double *, int)銆?br />tips:
鏈変漢鍙嶆槧絎笁姝ョ被鍨嬬湅涓嶆噦錛屽叾瀹炲緢綆鍗曪紝鎴戜婦涓緥瀛愶紝
1.int *p;p鐨勭被鍨嬫槸int *,
2.鑰宨nt *p[3],p鐨勭被鍨嬫槸int * [3]涔熷緢濂界悊瑙e氨鏄甫鏈変笁涓暟緇勶紝鍏冪礌綾誨瀷閮芥槸int *銆?br />3.鑰宨nt (*p[3])(int )錛宲鐨勭被鍨嬫槸int (*[3])(int),p鏄寚鍚戜竴涓?涓厓绱犵殑鏁扮粍錛屼笖姣忎釜鍏冪礌鐨勭被鍨嬮兘鏄痠nt (*)(int)銆?br />(鎸囬拡鏄粈涔堢被鍨嬩富瑕佺湅鎷彿銆?鍙楓乕]鍙?鍜屽弬鏁板垪琛ㄧ殑緇撳悎欏哄簭錛屽鏋滃彧鏈?*p)(int ,....)閭灝辨槸鍑芥暟鎸囬拡)
鎵浠ユ湁浠ヤ笅鎺ㄨ銆?/span>      
鍏冪礌鐨勬暟鎹被鍨嬫帹璁猴細
瑕佸垽鏂暟緇勬垨鎸囬拡鐨勭被鍨嬶紝灝辨槸鎷挎帀<鏁扮粍鍚嶃佹寚閽堝悕>鍚庣粍鎴愮殑錛岃屼笖[]鍜?鏄粠鍙沖悜宸︾粨鍚堛?br />瑕佸垽鏂暟緇勫厓绱犵殑綾誨瀷錛屽氨鏄湪鏁扮粍綾誨瀷鐨勫熀紜涓婃妸澶у皬鎷挎帀銆?br />
鐭ヨ瘑鐐?:
浣跨敤typedef鍒涘緩鍑芥暟鎸囬拡綾誨瀷鍒悕:
       1.typedef綆鍖栧嚱鏁版寚閽堝叾鏈川灝辨槸涓哄嚱鏁版寚閽堢殑綾誨瀷鍙栧埆鍚嶃?/span>
       濡備笅錛?br />       typedef const double *(*p_fun)(const double *, int);鍏舵槸姝ゆ椂鐩稿綋浜巘ypedef Const double *(*)(const double *, int)  p_fun;
褰撶劧浣犱笉鑳借繖鏍峰啓錛岃繖鏍峰啓鍙槸鏂逛究浣犵悊瑙c?br />
       p_fun涓嶆槸鍑芥暟鎸囬拡浜嗭紝鑰屾槸榪欑鍑芥暟鎸囬拡綾誨瀷鐨勫埆鍚嶏紝鎵浠ユ鏃朵綘鍙互榪欐牱鍋?br />       p_fun p1 = f1;
       p_fun pa[3] = {f1, f2, f3};
       p_fun (*pd)[3] = &pa;
       鏄笉鏄瘮涔嬪墠鐨勭畝鍗曡澶氾紒錛岃繖涓緢閲嶈鍝?br />濂戒簡鍑芥暟鎸囬拡灝辨葷粨鍒拌繖錛屽鏈変笉瓚寵鎸囨暀銆?br />浠ヤ笅鏄祴璇曚唬鐮侊細嫻嬭瘯浠g爜鍙傝冭嚜C++ Primer Plus
 1 //
 2 //
 3 //  Unit7
 4 //
 5 //  Created by sixleaves on 14-7-26.
 6 //  Copyright (c) 2014騫?nbsp;sixleaves. All rights reserved.
 7 //
 8 
 9 #include <iostream>
10 
11 const double * f1(const double ar[], int n);
12 const double * f2(const double [], int);
13 const double * f3(const double *, int);
14 
15 int main() {
16     
17     using namespace std;
18     double av[3] = {1112.3, 1542.6, 2227.9};
19     
20     
21     //pointer to a function
22     const double * (*p1)(const double *, int) = f1;
23     auto p2 = f2;//C++11 automatic type deduction
24     //pre-C11 can use the following code instead
25     //const double * (*p2)(const double *, int) = f2;
26     
27     
28     cout << "Using pointers to functions:\n";
29     cout << "Address Value\n";
30     cout << (*p1)(av, 3) << ": " << *(*p1)(av, 3) << endl;//涓ュ瘑鐨勯昏緫鎬ц皟鐢?/span>
31     cout << p2(av, 3) << ": " << *p2(av, 3) << endl;//鎰熸ц皟鐢?br />32     
33     //pa an array of pointers
34     //auto doesn't work with list initialization
35     const double *(*pa[3])(const double *, int) = {f1, f2, f3};
36     //but it does work for initializing to a single value
37     //pb a pointer to  fitst element of pa
38     auto pb = pa;
39     //pre-c11 can use the following code instead
40     //const double *(**pb)(const double *, int) = pa;
41     
42     cout << "\nUsing an array of pointer to functions:\n";
43     cout << " Address Value\n";
44     for (int i = 0; i < 3; i++) {
45         cout << pb[i](av, 3) << ": " << *pb[i](av, 3) <<endl;
46     }
47     
48     //what about a pointer to an array of function pointers;
49     cout << "\nUsing pointers to an array of function pointers:\n";
50     cout << " Adress Values\n";
51     //easy way to declare pc
52     auto pc = &pa;
53     //pre c11 can use the following code instead
54     //const double *(*(*pc)[3])(const double *, int) = &pa;
55     
56     cout << (*pc)[0](av, 3) << ": " << *(*pc)[0](av, 3) << endl;
57     
58     //hard way to declare pd;
59     const double *(*(*pd)[3])(const double *, int) = &pa;
60     
61     //store return value in pdb;
62     const double *pdb = (*pd)[1](av, 3);
63     cout << pdb << ": " << *pdb << endl;
64     
65     //alternative notation
66     cout << (*(*pd)[2])(av, 3) << ": " << *(*(*pd)[2])(av, 3) << endl;
67     
68     return 0;
69 }
70 const double * f1(const double ar[], int n) {
71     return ar;
72 }
73 const double * f2(const double ar[], int) {
74     return ar + 1;
75 }
76 const double * f3(const double ar[], int) {
77     return ar + 2;
78 }
79 


swp 2014-07-26 18:08 鍙戣〃璇勮
]]>
sixleaves涔婣C++鏉傝皥褰曠2绔?<<寰幆鍜岃鏁?gt;> http://www.shnenglu.com/sixleaves/archive/2014/02/21/205872.htmlswpswpFri, 21 Feb 2014 08:21:00 GMThttp://www.shnenglu.com/sixleaves/archive/2014/02/21/205872.htmlhttp://www.shnenglu.com/sixleaves/comments/205872.htmlhttp://www.shnenglu.com/sixleaves/archive/2014/02/21/205872.html#Feedback0http://www.shnenglu.com/sixleaves/comments/commentRss/205872.htmlhttp://www.shnenglu.com/sixleaves/services/trackbacks/205872.html榪欑珷鎴戝啓寰楁湁鐐規ュ垏錛屽簲涓轟箣鍓岰++瀛﹁繃錛屾湁浜涙蹇典竴璺寵岃繃錛岀湅涓嶆噦鐨勶紝鍙互寰涓嬫壘綰㈣壊瀛椾綋澶勫紑濮嬶紙浠庡驚鐜笉鍙樺紡鍒嗘瀽澶勫紑濮嬬殑鍒嗘瀽錛屽啀鍥炲ご鏉ョ湅榪欎釜錛夈?br />
 1 #include <iostream>
 2 #include <string>
 3 
 4 int main() {
 5     //ask for the person's name
 6     std::cout << "Please enter your first name: ";
 7 
 8     //read the name
 9     std::string name;
10     std::cin >> name;
11 
12     //build the message that we intend to write
13     const std:;string greeting = "Hello, " + name + "!";
14 
15     //we have to rewrite this part
16 }
#
#鍒嗘瀽錛氭垜浠幇鍦ㄩ渶瑕侀噸鍐欙紙閲嶆瀯//we have...鍚庨潰鐨勪唬鐮侊級錛屽簲璇ヨ繖鏍鋒濊冿紝浠ュ墠鐨勯偅涓▼搴忎笉鍏峰濂界殑鍙墿灞曟э紝涓轟粈涔堝憿錛熼鍏堝鏋滆姹傝緭鍏ョ殑妗嗘灦緙栫▼10琛岋紙絀虹櫧#琛屽彉鎴?0琛岋級錛屽悗闈㈢殑浠g爜涔呰澶氬姞寰堝琛岋紝涓琛岃鐨勮繘琛岃緭鍑恒傝繖鏃舵垜浠彲浠ョ敤寰幆瀵逛唬鐮佽繘琛岄噸鏋勩傛垜浠厛鍒嗘瀽錛屽湪greeting涓婁笅絀虹櫧琛屽彧鏈変竴琛岋紝鎵浠ユ垜浠敤pad
#琛ㄧず絀虹櫧琛岋紝鑰屾葷殑琛屾暟涓? * pad + 3錛堝ご灝懼姞greeting閭h錛夈傝繖鏍鋒垜浠氨鍙互璁╃▼搴忚緭鍑轟換鎰忓琛屻備簬鏄湁濡備笅浠g爜
const int pad = 1;

const int rows = pad * 2 + 3;
#鍙﹀鎴戜滑榪欎釜杈撳嚭鐨勬鏋舵槸瑕佽宸﹀彸涓よ竟鐨勭┖鐧芥暟鍜屼笂涓嬩袱绔殑絀虹櫧鏁扮浉鍚岋紝鎵浠ヤ篃鍙渶瑕佸畾涔変竴涓彉閲忓氨澶熶簡銆傛瘡涓琛岃緭鍑虹殑瀛楃鏁板氨鏄痝reeting鐨勯暱搴﹀姞涓妏ad * 2鍔犱笂涓や釜#涓や釜鏄熷彿銆傚嵆濡備笅浠g爜const std::string::size_type cols = greeting.size() + pad * 2 + 2;

 1 
 2 #include <iostream>
 3 #include <string>
 4 using std::cin;        using std::endl;
 5 using std::cout;       using std::string;
 6 int main() {
 7     cout << "Please enter your first name: ";
 8 
 9     string name;
10     cin >> name;
11 
12     const string greeting = "Hello, " + name + "!";
13 
14     const int pad = 1;
15 
16     const int rows = pad * 2 + 3;
17     const string::size_type cols = greeting.size() + pad * 2 + 2;
18 
19     cout << endl;
20 
21     // invariant:we have written r rows so far
22     for(int r = 0; r != rows; ++r) {
23 
24         string::size_type c = 0;
25 
26         // invariant:we have written c characters so far in the current row
27         while(c != cols) {
28 
29             if(r == pad + 1 && c == pad + 1) {
30                 cout << greeting;
31                 c += greeting.size();
32             } else {
33 
34                 if(r == 0 || r == rows -1 || c == 0 || c == cols - 1)
35                     cout << "*";
36                 else
37                     cout << " ";
38                 ++c;
39             }
40         }
41 
42         cout << endl;
43 
44     }
45     return 0;
46 }
#絎竴涓細錛氳鏄巗tring鍚嶅瓧瀹氫箟鍦ㄥ悕瀛楃┖闂磗td涓紝鑰岀浜屼釜錛氾細鍒欒〃紺簊ize_type鏉ヨ嚜string綾匯俿td::string瀹氫箟浜唖ize_type錛岀敤鏉ヨ〃紺轟竴涓猻tring涓惈鏈夌殑瀛?絎︽暟鐩傚鏋滈渶瑕佷竴涓眬閮ㄥ彉閲忔潵琛ㄧず涓涓猻tring闀垮害錛屽彲浠ヤ嬌鐢╯td::string::size_type綾誨瀷瀹氫箟涓涓彉閲忋?br /> #size_type鏄竴涓棤絎﹀彿鐨勭被鍨?br /> #杈撳嚭杈圭晫瀛楃錛屽鏋渞 = 0錛岀敱寰幆涓嶅彉寮忓彲浠ョ煡閬擄紝鐜板湪涓琛屼篃娌℃湁杈撳嚭銆傛墍浠ュ綋r = row - 1錛屽凡緇忚緭鍑轟簡row - 1琛岋紝鎺ヤ笅鏉ヨ緭鍑虹殑鏄渶鍚庝竴涓儴鍒嗭紝綾諱技鐨勶紝濡傛灉c = 0錛岃緭鍑虹殑灝嗘槸絎竴鍒楃殑閮ㄥ垎銆?br /> #杈撳嚭杈圭晫絎﹀彿錛?br /> #閭d箞鎴戜滑濡備綍鍒ゆ柇杈撳嚭greeting榪欒鍛紝鐢卞驚鐜笉鍙樺紡錛屾垜浠彲浠?r = pad + 1 鏃訛紝c = pad + 1鏃訛紝寮濮嬭緭鍑篻reeting銆?br />
#絎簩绔犲啓寰楁湁鐐逛貢錛屼笂闈唬鐮佺湅涓嶆噦鐨勶紝璇風湅涓嬮潰鍒嗘瀽
#棣栧厛鎴戜滑瑕佷粙緇嶄竴涓蹇碉紝鍙仛寰幆涓嶅彉寮忥紝寰幆涓嶅彉寮忓氨鏄垜浠緗竴涓柇璦錛岃璇ユ柇璦鍦ㄨ寰幆涓緇堥兘鎴愮珛錛岀粨鏉熷悗涔熸垚绔嬶紝榪欐牱榪欎釜鏂█鍏跺疄灝辨槸榪欐紼嬪簭鐨勬剰鎬濄傜湅濡?br /> #涓嬩唬鐮侊細
//invariant:we have written r rows so far

int r = 0;
//setting r to 0 makes the invariant true

while(r != rows) {
    //we can assume that the invariant is true here
    
//waiting a row of output makes the invariant false
    std::cout << std::endl;
    //incrementing r makes the invariant true again
    r++;
}
//we can conclude that the invariant is true here
#棣栧厛浣犲簲璇ユ兂涓鎯寵紜繚涓嶅彉寮忓緇堜負true錛屽彧瑕佺‘淇濆湪寰幆榪涘叆鐐逛負true錛屼竴嬈″驚鐜粨鏉熺偣涓簍rue錛岄偅涔堣繖涓笉鍙樺紡涔呮案榪滀負true錛寀nderstand錛熷鏋滆繕涓嶇悊瑙o紝鍏堝惂鎴戣
 #鐨勮繖鍙ヨ瘽鐞嗚В浜嗭紝鍦ㄧ戶緇線涓嬬湅錛屼笉鐒朵綘涓嶇煡閬撴垜鍦ㄨ浠涔堜笢瑗?
 #鎴戜滑鐨勪笉鍙樺紡灝辨槸涓婅堪鏂█invariant:we have written r rows so far 
 #鎴戜滑鍒嗘瀽榪囷紝涓嶅彉寮忕殑涓や釜鏂偣錛屼竴涓鍦ㄥ紑澶達紝涓涓湪緇撳熬錛屾墍浠ュ紑澶存椂r = 0銆傛鏃剁▼搴忎竴琛屼篃娌¤緭鍑猴紝涓嶅彉寮忎負true錛屽湪緇撳熬澶剅++鍚庯紝浠嶄負true錛屼負浠涔堝憿錛熶婦涓緥瀛愶紝r = 0錛岃繘鏉ヤ箣鍚庯紝灝嗚緭鍑轟竴琛岋紝鎵浠ユ鏃秗涓嶅簲璇ュ湪涓?錛岃屽簲璇ヤ負1.
 #榪欐槸姣忎竴琛岃緭鍑虹殑妗嗘灦錛岃漿鎹㈡垚for寰幆灝辨槸涓婇潰鐩稿簲鐨勪唬鐮侊紝鑰岃嚦浜庡彟澶栦竴涓驚鐜竴鏍蜂釜閬撶悊銆?br />#涓嬮潰鍐嶄粙緇嶄竴涓噸瑕佺殑姒傚康錛岃繖涓蹇墊垜涔嬪墠榪樼湡娌″濂斤紝鐪嬪畬鍚庯紝鎭嶇劧澶ф偀錛屽ぇ嫻嬪ぇ鎮熼樋錛侀偅灝辨槸寰幆鏃剁殑璁℃暟闂銆?br /> #鍦–涓瑿++涓垜浠啓寰幆緇忓父鏄噸int i = 0錛屼粠0寮濮嬫槸涓嶏紵灝辯畻鏄紝浣犳槸涓嶆槸緇忓父榪欐牱鍐檉or(int i = 0; i <= number; i++);浣嗘槸鏇村ソ鐨勫啓娉曞簲璇ユ槸for(int i = 0; i  #!= number; i++);涓轟粈涔堝憿錛熻鍚垜鎱㈡參閬撴潵.
 #棣栧厛鎴戜滑鐭ラ亾鍦ㄤ笉瀵圭О鍖洪棿[0, rows)璁℃暟鐨勮瘽錛屽緢鏄庢樉灝辨槸rows涓暟錛屼絾鏄鏋滀綘浣跨敤鐨勬槸瀵圭О鍖洪棿錛孾num,rows]鍒欐湁rows - num + 1涓暟錛屾槸涓嶆槸寰堜笉鏄庢樉錛屽啀鍒欎粠0寮  #濮嬩竴鐩簡鐒訛紝鍒浣犵湅涓嶅嚭鏉ワ紝鎴戝湪涓句釜渚嬪瓙錛?錛?6],鍜孾21,86]鍝竴涓綘鑳藉揩閫熷垽鏂嚭鏈夊嚑涓暟銆?br /> #鏈夌殑浜哄張璇達紝榪欑畻浠涔堥樋錛屾垜浠?寮濮嬭礉[1,66]錛屼笉灝卞綆椾竴涓暟涔堬紝涔犳儻灝卞ソ銆傛垜鎯寵錛屼綘璇寸殑娌$矖錛屼絾鎴戞噿錛岀敤涓嶅縐板尯闂磋窡鍧楃畻鍑猴紝鏇翠笉浼氬嚭閿欍傚湪鍒欙紝鐢ㄤ笉瀵圭О鍖洪棿鐨勫ソ  #澶勬槸瀹規槗鍜宨nvariant錛堝驚鐜笉鍙樺紡錛夌浉緇撳悎錛屼緥濡傦紝濡傛灉浣犱粠1寮濮嬭鏁幫紝鏈夌殑浜烘兂鎴戜滑鎶婁笉鍙樺紡鏀規垚鐜板湪杈撳嚭絎瑀琛岋紝浣嗘槸榪欐牱鏄笉鑳戒綔涓轟竴涓笉鍙樺紡鐨勶紝鎵璋撲笉鍙樺紡錛屽氨鏄?br /> #榪欎釜鏂█姘歌繙姝g‘錛屼絾鏄綋浣犵粨鏉熷驚鐜椂r = rows + 1錛屽氨鍙樻垚浜嗚緭鍑虹rows + 1琛岋紝浣嗚繖涓笉鍙樺紡灝卞彉鎴愰敊鐨勯笩錛寀nderstand銆?br /> #鍐嶅垯鎴戜滑閫夎咃紒=鑰屼笉鏄?lt;=鏉ヤ綔涓烘瘮杈冩搷浣滅銆傝繖涓樊鍒緢灝忥紝浣嗘槸寰堜笉涓鏍鳳紝鍓嶈咃紝寰幆緇撴潫鏃訛紙鍙娌℃湁鍦ㄥ驚鐜噷break錛夛紝灝辮兘鍒ゆ柇姝ゆ椂r = rows錛屼絾鏄鏋滄槸鍚庤咃紝鎴? #浠繖鑳借瘉鏄庤嚦灝戣緭鍑轟簡rows琛岋紝涓哄暐錛熷洖蹇嗕笅瀛﹁繃鐨刴ath錛?lt;=,鏄粈涔堟剰鎬濓紵
 #榪樻湁涓鏉″ソ澶勶紝鎴戝氨涓嶇綏鍡︿簡錛岀患涓婃墍灞烇紝浣犲彲浠ュ彂鐜頒粠0寮濮嬭鏁扮殑濂藉錛侊紝鎯沖綋涓鏃訛紝鍦ㄥ啓閾捐〃鏃訛紝灝辨槸鍥犱負榪欎釜璁℃暟闂錛岃嚜宸變篃鏁翠簡涓瘉鏄庢柟娉曪紝鍝堝搱錛屾瘡鎯沖埌鏃╁氨鏈夋洿  #綆鍗曠殑鏂瑰紡浜嗐?br />#鏈漢鎵嶇枏瀛︽祬錛岀湅涓嶆噦鐨勶紝鍙互鐣欒█璁ㄨ涔嬨?img src ="http://www.shnenglu.com/sixleaves/aggbug/205872.html" width = "1" height = "1" />

swp 2014-02-21 16:21 鍙戣〃璇勮
]]>
sixleaves涔婣C++鏉傝皥褰曠1绔?<<浣跨敤瀛楃涓?gt;>http://www.shnenglu.com/sixleaves/archive/2014/02/20/205856.htmlswpswpThu, 20 Feb 2014 12:38:00 GMThttp://www.shnenglu.com/sixleaves/archive/2014/02/20/205856.htmlhttp://www.shnenglu.com/sixleaves/comments/205856.htmlhttp://www.shnenglu.com/sixleaves/archive/2014/02/20/205856.html#Feedback0http://www.shnenglu.com/sixleaves/comments/commentRss/205856.htmlhttp://www.shnenglu.com/sixleaves/services/trackbacks/205856.html 浠g爜濡備笅
 1 // ask for person's name, and greet the person
 2 
 3 #include <iostream>
 4 #include <string>
 5 
 6 int main() {
 7     //ask for the person's name
 8     std::cout << "Please enter your first name: ";
 9 
10     //read the name
11     std::string name;
12     std::cin >> name;
13 
14     //write a greeting
15     std::cout << "Hello, " << name << "!" << std::endl;
16     return 0;
17 }
#name灝辨槸涓涓彉閲忥紙瀹冪殑綾誨瀷鏄痵td::string錛夛紝鑰屽彉閲忔槸涓涓湁鍚嶅瓧鐨勫璞★紙鍙橀噺涓瀹氭槸瀵硅薄錛屼絾瀵硅薄涓嶄竴瀹氫負鍙橀噺錛屽洜涓哄璞″彲浠ユ病鏈夊悕瀛楋紝鑰屼笖瀵硅薄瀵瑰簲緋葷粺涓殑涓鍧楀唴瀛橈級銆?br /> #line 11錛氭槸涓涓猟efinition錛屽嵆鏄竴涓畾涔夛紝瀹氫箟浜嗕竴涓悕鍙仛name鐨剆td::string綾誨瀷鐨勫彉閲忋傝屼笖鍑虹幇鍦ㄤ竴涓嚱鏁版彁涓紝鎵浠ユ槸涓涓猯ocal variable錛屽綋紼嬪簭鎵ц鏀懼埌}錛屽氨浼氶攢姣乶ame鍙橀噺錛屽茍涓旈噴鏀緉ame鍗犵敤鐨勫唴瀛橈紝浠ヨ鍏朵粬鍙橀噺浣跨敤銆?br /> #line 12錛?gt;>浠庢爣鍑嗚緭鍏ヤ腑璇誨彇涓涓瓧絎︿覆錛屽茍涓斾繚瀛樺畠鍦╪ame瀵硅薄涓傚綋閫氳繃鏍囧噯搴撹鍙栦竴涓瓧絎︿覆鏃訛紝浠栦細蹇界暐杈撳叆涓殑鎵鏈夌┖鐧界錛岃屽惂鍏朵粬瀛楃璇誨彇鍒皀ame涓紝鐩村埌瀹冮亣鍒板叾浠栫┖鐧界鎴栬呮枃浠剁粨鏉熸爣蹇椼傚洜姝td::cin >> name;鐨勭粨鏋滄槸浠庢爣鍑嗚緭鍏ヤ腑璇誨彇涓涓崟璇嶃?br /> #杈撳叆杈撳嚭搴撲細鎶婂畠鐨勮緭鍑轟繚瀛樺湪buffer鐨勫唴閮ㄦ暟鎹粨鏋勪笂錛岄氳繃緙撳瓨鍙互浼樺寲杈撳嚭鎿嶄綔銆傦紙鍥犱負璁稿鎿嶄綔緋葷粺鍦ㄥ悜杈撳嚭璁懼鍐欏叆瀛楃鏃墮渶瑕佽姳澶ч噺鐨勬椂闂達級
#鏈変笁涓簨浠朵細淇冧嬌緋葷粺鍒鋒柊緙撳啿鍖恒?br />  #絎竴錛岀紦瀛樺尯婊′簡錛岃嚜鍔ㄥ埛鏂般?br />  #絎簩錛屾爣鍑嗗簱琚姹傝鍙栨爣鍑嗚緭鍏ユ祦銆傦紙鍗硈td::cin鏄痵td::istream綾誨瀷錛夈傚line 12.
 #絎笁錛屾樉紺虹殑瑕佹眰鍒鋒柊緙撳啿銆傦紙std::endl緇撴潫浜嗚緭鍑鴻錛屽茍涓斿埛鏂扮紦鍐插尯)
# 1 //ask for a person's name, and generate a framed greeting
 2 #include <iostream>
 3 #include <string>
 4 
 5 int main() {
 6     std::cout << "Please enter your first name: ";
 7     std::string name;
 8     std::cin >> name;
 9     //build the message that we intend to write
10     const std::string greeting = "Hello, " + name + "!";
11 
12     //build the second and fourth lines of the input
13     const std::string spaces(greeting.size(), ' ');
14     const std::string second = "* " + spaces + " *";
15 
16     //build the first and fifth lines of the output
17     const std::string first(second.size(), '*');
18 
19     //write it all
20     std::cout << std::endl;
21     std::cout << first <<std::endl;
22     std::cout << second << std::endl;
23     std::cout << "* " << greeting << " *" << std::endl;
24     std::cout << second << std::endl;
25     std::cout << first << std::endl;
26 
27     return 0;
28 }
#greeting鐨勫畾涔夊寘鍚笁涓柊鐨勬蹇?/div>
  #絎竴涓細鍦ㄥ畾涔夊彉閲忔椂鍊欙紝鍙互緇欏畾瀹冪殑鍊箋?/div>
  #絎簩涓細鐢?鏉ヨ繛鎺ュ瓧絎︿覆錛屼絾鏄繖涓や釜涓繀欏昏嚦灝戞湁涓涓槸string瀵硅薄銆傦紙+涔熸槸宸︾粨鍚堟х殑錛?/div>
   #錛?鍦ㄨ繖閲屾槸榪炴帴浣滅敤),寮曞嚭overloaded錛堥噸杞斤級姒傚康錛岃繖涓搷浣滅琚噸杞戒簡錛屽洜涓哄叾瀵逛笉鍚屾搷浣滄暟鏈変笉鍚岀殑鍚箟銆?/div>
  #絎笁涓細const鍙互浣滀負鍙橀噺瀹氫箟鐨勪竴閮ㄥ垎錛岃繖涔堝仛淇濊瘉鍦ㄥ彉閲忕敓瀛樻湡鍐咃紝涓嶆敼鍙樺畠鐨勫箋?/div>
   #濡傛灉涓涓彉閲忓畾涔変負const錛屽繀欏誨湪瀹氫箟鏃跺垵濮嬪寲錛屽惁鍒欏悗闈㈠氨涓嶈兘鍐嶅垵濮嬪寲銆?/div>
#const std::string spaces(greeting.size(), ' ');鏉ヤ粙緇嶅彟涓変釜姒傚康
  #絎竴涓細鏋勯犲嚱鏁?/div>
  #絎簩涓細鎴愬憳鍑芥暟(member function),鍏跺疄鍙互鍚reeting鐪嬫垚瀵硅薄錛屽悜鍏跺彂閫乻ize娑堟伅鑾峰彇鍏墮暱搴︺?/div>
  #絎笁涓細瀛楃鐩存帴閲忋傦紙鐢?錛堝崟寮曞彿錛夛紝鑰屽瓧絎︿覆鐩存帴閲忓垯鏄敤“鍙鳳級.瀛楃鐩存帴閲忕殑綾誨瀷鏄唴緗簬璇█鏍稿績鐨刢har綾誨瀷銆?/div>

swp 2014-02-20 20:38 鍙戣〃璇勮
]]>sixleaves涔婣C++鏉傝皥褰曠0绔?/title><link>http://www.shnenglu.com/sixleaves/archive/2014/02/19/205855.html</link><dc:creator>swp</dc:creator><author>swp</author><pubDate>Wed, 19 Feb 2014 14:10:00 GMT</pubDate><guid>http://www.shnenglu.com/sixleaves/archive/2014/02/19/205855.html</guid><wfw:comment>http://www.shnenglu.com/sixleaves/comments/205855.html</wfw:comment><comments>http://www.shnenglu.com/sixleaves/archive/2014/02/19/205855.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.shnenglu.com/sixleaves/comments/commentRss/205855.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/sixleaves/services/trackbacks/205855.html</trackback:ping><description><![CDATA[@import url(http://www.shnenglu.com/CuteSoft_Client/CuteEditor/Load.ashx?type=style&file=SyntaxHighlighter.css);@import url(/css/cuteeditor.css); 鍓嶈█錛?br /> 閫夋嫨鑷繁蹇冧腑鏈鏂版鐨勪簨鎯呭幓鍋氾紝姣曠珶涔嬪墠璁$畻鏈哄熀紜璇劇▼鍩虹涔熸墦寰椾笉閿欙紝娣卞叆鐨勫涔燙++銆傛垜涓鐩寸浉淇℃瘝浜茶榪囩殑涓鍙ヨ瘽錛?#8220;涓嶈璁や負浣犲仛涓嶅埌錛屽彧瑕佷綘鎯沖幓鍋氾紝灝變竴瀹氳兘鍋氬緱鍒?#8221;銆傝嚜鎴戝媺鍔變箣銆傚悓鏃跺紑鍗氭槸涓轟簡鎬葷粨鑷繁瀛︿範錛屽笇鏈涜兘瀵規湁浜涗漢鏈夋墍甯姪銆?br /> <br /> 鐢眝ery simple鐨勫皬紼嬪簭鍖呭惈鐨勮澶欳++鍩虹鐭ヨ瘑銆?br /> <div style="background-color: #eeeeee; font-size: 13px; border-left-color: #cccccc; padding: 4px 5px 4px 4px; width: 98%; word-break: break-all;"><!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><span style="color: #008080; ">1</span> <span style="color: #008000; ">//</span><span style="color: #008000; ">a small C++ program</span><span style="color: #008000; "><br /> </span><span style="color: #008080; ">2</span> <span style="color: #008000; "></span>#include <iostream><br /> <span style="color: #008080; ">3</span> <br /> <span style="color: #008080; ">4</span> <span style="color: #0000FF; ">int</span> main()<br /> <span style="color: #008080; ">5</span> {<br /> <span style="color: #008080; ">6</span>      std::cout << "Hello, world!" << std::endl;<br /> <span style="color: #008080; ">7</span>      <span style="color: #0000FF; ">return</span> 0;<br /> <span style="color: #008080; ">8</span> }</div> #紼嬪簭鐨勭涓琛屼負娉ㄩ噴錛?/鏄娉ㄩ噴銆? <br /> #std鏄竴涓懡鍚嶇┖闂達紙鍚嶅瓧絀洪棿錛塶amespace <br /> #瀵逛簬return璇彞錛宺eturn 0琛ㄧず紼嬪簭姝e父閫鍑恒?nbsp;<br /> #瀵逛簬return璇彞錛屽鏋滄槸鍑芥暟鐨勫畾涔夎姹傝繑鍥炴煇縐嶇壒孌婄被鍨嬬殑鍊鹼紝閭d箞榪欎釜鍑芥暟涓墍鏈夌殑return璇彞閮藉繀欏昏繑鍥炵浉搴旂被鍨嬬殑鍊箋?br /> #鍓栨瀽“Hello world錛佺▼搴忕殑鎬葷粨”濡備笅<br />    #璇ョ▼搴忎腑鏈変袱涓瘡絀緾++鐨勬蹇碉紝琛ㄨ揪寮忓拰鐢熷瓨絀洪棿錛坰cope錛?br />     #琛ㄨ揪寮?br />      #琛ㄨ揪寮忕殑浣滅敤鏄姹傜郴緇熻繘琛岃綆椼傝綆楀悗浼氱敓鎴愪竴涓粨鏋滐紝鍚屾椂涔熷彲鑳戒細鏈変竴浜涘壇浣滅敤銆傦紙鎵璋撶殑鍓綔鐢ㄥ氨鏄畠浼氬獎鍝嶇▼搴忔垨鑰呯郴緇熺殑鐘舵侊級銆傝6涔熸槸涓〃杈懼紡<br />      錛屽畠鐨勫壇浣滅敤鏄湪鏍囧噯杈撳嚭嫻佽緭鍑?#8220;Hello錛?world錛?#8221;騫朵笖褰撹緇撴潫銆?br />      #琛ㄨ揪寮忕敱鎿嶄綔絎﹀拰鎿嶄綔鏁幫紙operand錛夋瀯鎴愩傚琛?錛屼袱涓?lt;<絎﹀彿閮芥槸鎿嶄綔絎︼紝鑰屽墿涓嬬殑std::cout銆?#8220;Hello world”銆乻td::endl鍒欐槸鎿嶄綔鏁般?br />       #鎿嶄綔鏁幫細姣忎釜鎿嶄綔鏁伴兘鏄竴縐嶇被鍨嬨傦紙鍗抽兘琛ㄧず涓縐嶆暟鎹粨鏋勫拰瀹冮傚悎鐨勬搷浣滐紝瀹冨喅瀹氫簡鎿嶄綔絎︾殑鑴炬皵錛堜駭鐢熺殑緇撴灉錛夛紝鎬昏岃█涔嬪彧瑕佽浣忔搷浣滄暟鍐沖畾浜嗘搷浣滅鐨?              鑴炬皵銆傦級錛坕nt琛ㄧず鏁存暟綾誨瀷錛宻td::ostream瀹氫箟涓烘祦杈撳嚭錛宻td::cout鐨勭被鍨嬫槸std::ostream錛?br />       #鎿嶄綔絎︼細<<鎿嶄綔絎︽湁宸︾粨鍚堟э紙left-assocoative錛夊乏緇撳悎鎬ф槸涓縐嶈椽蹇冩濇兂錛屽綋琛ㄨ揪寮忓嚭鐜頒袱涓互涓婄殑<<錛屽乏緇撳悎鎬ф繪槸璐績宸﹁竟鐨勬搷浣滄暟銆?br />       #鍒嗘瀽錛氱涓涓?lt;<鏄互std::cout浣滀負瀹冪殑宸︽搷浣滄暟錛岃屼互"Hello錛?world"浣滀負鍙蟲搷浣滄暟銆?br />             絎簩涓?lt;<鐨勫乏鎿嶄綔鏁版槸涓涓紙鐢熸垚std::cout緇撴灉錛夌殑琛ㄨ揪寮忥紝鍏剁被鍨嬫槸std::ostream.鍙蟲搷浣滄暟鏄痵td::endl,鏄竴涓猰ainpulator錛堟帶鍒剁錛夈傚綋<<<br />             宸︽搷浣滅鏄痵td::ostream,鑰屽彸鎿嶄綔鏁版槸mainpulator鏃訛紝<<浼氭牴mainpulator鐨勮涔夋潵鎺у埗嫻佽緭鍑猴紝騫朵笖榪斿洖嫻佷綔涓哄畠鐨勭粨鏋溿傚錛氬綋mainpulator鏄?br />             std::endl鏃訛紝瀹冪粨鏉熷綋鍓嶈緭鍑鴻銆?br />     #scope<br />      #namespace:鍛藉悕絀洪棿鏈哄埗錛岀浉褰撲簬java涓殑鍖呮満鍒躲?br />      #scope,涓枃縐頒負鐢熷瓨絀洪棿錛岋細錛氭槸鐢熷瓨絀洪棿鎿嶄綔絎︼紝::宸﹁竟鏄敓瀛樼┖闂寸殑琛ㄧず絎td錛岃屽彸杈瑰氨鏄畾涔夊湪鍛藉悕絀洪棿涓殑鍚嶅瓧銆?br /> #“Hello錛寃orld”縐頒負瀛楃涓茬洿鎺ラ噺錛屽瓧絎︿覆鐩存帴閲忎腑錛屼竴浜涘瓧絎﹀墠闈㈠姞涓?\)鍚庡叿鏈夌壒孌婄殑鎰忎箟銆?img src ="http://www.shnenglu.com/sixleaves/aggbug/205855.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/sixleaves/" target="_blank">swp</a> 2014-02-19 22:10 <a href="http://www.shnenglu.com/sixleaves/archive/2014/02/19/205855.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item></channel></rss> <a href="http://www.shnenglu.com/">青青草原综合久久大伊人导航_色综合久久天天综合_日日噜噜夜夜狠狠久久丁香五月_热久久这里只有精品</a> <div style="position:fixed;left:-9000px;top:-9000px;"><font id="pjuwb"></font><button id="pjuwb"><pre id="pjuwb"></pre></button><sub id="pjuwb"></sub><tbody id="pjuwb"><var id="pjuwb"><address id="pjuwb"></address></var></tbody><listing id="pjuwb"><label id="pjuwb"><strong id="pjuwb"></strong></label></listing><wbr id="pjuwb"><small id="pjuwb"><tbody id="pjuwb"></tbody></small></wbr><ins id="pjuwb"><xmp id="pjuwb"></xmp></ins><style id="pjuwb"></style><label id="pjuwb"><em id="pjuwb"><li id="pjuwb"></li></em></label><samp id="pjuwb"></samp><menu id="pjuwb"><input id="pjuwb"></input></menu><pre id="pjuwb"><tbody id="pjuwb"><tfoot id="pjuwb"><button 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