锘??xml version="1.0" encoding="utf-8" standalone="yes"?>
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int gcd(int a, int b)
{
int r;
while(b)
{
r = a%b;
a = b;
b = r;
}
return a;
}
鐩稿叧鐞嗚濡備笅錛?br> 銆岃緱杞浉闄ゆ硶銆嶅張鍙仛銆屾鍑犻噷寰楃畻娉曘嶏紝鏄叕鍏冨墠 300 騫村乏鍙崇殑甯岃厞鏁板瀹舵鍑犻噷寰楀湪浠栫殑钁椾綔銆婂嚑浣曞師鏈嬫彁鍑虹殑銆傚埄鐢ㄨ繖涓柟娉?鍙互杈冨揩鍦版眰鍑轟袱涓嚜鐒舵暟鐨勬渶澶у叕鍥犳暟錛屽嵆 HCF 鎴栧彨鍋?gcd銆傛墍璋撴渶澶у叕鍥犳暟錛屾槸鎸囧嚑涓暟鐨勫叡鏈夌殑鍥犳暟涔嬩腑鏈澶х殑涓涓紝渚嬪 8 鍜?12 鐨勬渶澶у叕鍥犳暟鏄?4錛岃浣?gcd(8,12)=4銆?br> 鍦ㄤ粙緇嶈繖涓柟娉曚箣鍓?鍏堣鏄庢暣闄ゆх殑涓浜涚壒鐐?娉ㄤ互涓嬫枃鐨勬墍鏈夋暟閮芥槸姝f暣鏁?浠ュ悗涓嶅啀閲嶈.
鎴戜滑鍙互榪欐牱緇欏嚭鏁撮櫎浠ョ殑瀹氫箟:
瀵規柤涓や釜鑷劧鏁?a 鍜?b錛岃嫢瀛樺湪姝f暣鏁?q錛屼嬌寰?a=bq錛屽垯 b 鑳芥暣闄?a錛岃浣?b | a錛屾垜浠彨 b 鏄?a 鐨勫洜鏁幫紝鑰?a 鏄?b 鐨勫嶆暟銆傞偅楹煎鏋?c | a錛岃屼笖 c | b錛屽垯 c 鏄?a 鍜?b 鐨勫叕鍥犳暟銆?br> 鐢辨,鎴戜滑鍙互寰楀嚭浠ヤ笅涓浜涙帹璁猴細
鎺ㄨ涓錛氬鏋?a | b錛岃嫢 k 鏄暣鏁幫紝鍒?a | kb銆傚洜涓虹敱 a | b 鍙煡 ha=b錛屾墍浠?(hk)a=kb錛屽嵆 a | kb.
鎺ㄨ浜岋細濡傛灉 a | b 浠ュ強 a | c錛屽垯 a | (b±c)銆傚洜涓虹敱 a | b 浠ュ強 a | c錛屽彲鐭?ha=b錛宬a=c錛屼簩寮忕浉鍔?寰?(h+k)a=b+c,鍗?a | (b+c).鍚屾牱鎶婁簩寮忕浉鍑忓彲寰?a | (b-c)銆?br> 鎺ㄨ涓夛細濡傛灉 a | b 浠ュ強 b | a錛屽垯 a=b銆傚洜涓虹敱 a | b 浠ュ強 b | a錛屽彲鐭?ha=b錛宎=kb錛屽洜姝?a=k(ha)錛宧k=1錛岀敱鏂?h 鍜?k 閮芥槸姝f暣鏁幫紝鏁?h=k=1錛屽洜姝?a=b銆?/p>
杈楄漿鐩擱櫎娉曟槸鐢ㄦ潵璁$畻涓や釜鏁扮殑鏈澶у叕鍥犳暟錛屽湪鏁板煎緢澶ф椂灝ゅ叾鏈夌敤鑰屼笖搴旂敤鍦ㄧ數鑴戠▼寮忎笂涔熷崄鍒嗙畝鍗曘傚叾鐞嗚濡備笅錛?br> 濡傛灉 q 鍜?r 鏄?m 闄や互 n 鐨勫晢鍙婁綑鏁幫紝鍗?m=nq+r錛屽垯 gcd(m,n)=gcd(n,r)銆?nbsp; 璇佹槑鏄繖鏍風殑:
璁?a=gcd(m,n)錛宐=gcd(n,r)
鍒欑敱 a | m 鍙?a | n錛屽彲寰?a | (m-nq)(鐢辨帹璁轟竴鍙婃帹璁轟簩寰楀嚭鐨?錛屽嵆 a | r 錛屽張 a | n錛屾墍浠?a | b銆?br> 鐢?b | r 鍙?b | n錛屽彲寰?b | (nq+r)錛屽嵆 b | m錛屽張 b | n錛屾墍浠 | a銆?br> 鍥犱負 a | b 騫朵笖 b | a錛屾墍浠?a=b錛屽嵆 gcd(m,n)=gcd(n,r)銆?
涓句緥璁$畻 gcd(546, 429),鐢辨柤 546=1(429)+117,429=3(117)+78,117=1(78)+39,78=2(39),鍥犳
gcd(546, 429)
=gcd(429, 117)
=gcd(117, 78)
=gcd(78, 39)
=39
姝ゅ鍐嶆坊鍔犱竴涓▼搴忎緥瀛愶紝涓嶈繃涓嶆槸鍒╃敤杈楄漿鐩擱櫎娉?br>姹傛渶澶у叕綰︽暟鍜屾渶灝忓叕鍊嶆暟:
#include <iostream>
using namespace std;
int gec,lcm;
void process(int x,int y)
{
gcd=x<y?x:y;
lcm=x<y?y:x;
for(gcd=x<y?x:y;gcd>1;gcd--)if(x%gcd==0&&y%gcd==0)break;
for(lcm=x<y?x:y;lcm>1;lcm++)if(lcm%x==0&&lcm%y==0)break;
return;
}
鐢遍珮鎵嬫寚鐐?br>瀵逛簬m.n鐨勬牸寮忚繕鍙互鐢ㄥ涓嬫柟娉曡〃紺猴紙渚嬶級
char ch[20];
printf("%*.*s\n",m,n,ch);
鍓嶈竟鐨?瀹氫箟鐨勬槸鎬葷殑瀹藉害錛屽悗杈圭殑瀹氫箟鐨勬槸杈撳嚭鐨勪釜鏁般傚垎鍒搴斿闈㈢殑鍙傛暟m鍜宯 銆傛垜鎯寵繖縐嶆柟娉曠殑濂藉鏄彲浠ュ湪璇彞涔嬪瀵瑰弬鏁癿鍜宯璧嬪鹼紝浠庤屾帶鍒惰緭鍑烘牸寮忋?
涓縐嶈緭鍑烘牸寮?%n 鍙互灝嗘墍杈撳嚭瀛楃涓茬殑闀垮害鍊艱祴緇愪竴涓彉閲? 瑙佷笅渚?
int slen;
printf("hello world%n", &slen);
鎵ц鍚庡彉閲忚璧嬪間負11
scanf鏍煎紡鎺у埗鐨勫畬鏁存牸寮忥細
% * m l鎴杊 鏍煎紡瀛楃
鈶犳牸寮忓瓧絎︿笌printf鍑芥暟涓殑浣跨敤鏂瑰紡鐩稿悓錛屼互%d銆?o銆?x銆?c銆?s銆?f銆?e錛屾棤%u鏍煎紡銆?g鏍煎紡銆?br>鈶″彲浠ユ寚瀹氳緭鍏ユ暟鎹墍鍗犲垪瀹斤紝緋葷粺鑷姩鎸夊畠鎴彇鎵闇鏁版嵁銆傚:
scanf(“%3d%3d”,&a,&b);
杈撳叆錛?23456
緋葷粺鑷姩灝?23璧嬬粰a,456璧嬬粰b銆?br>鈶?鍚庣殑“*”闄勫姞璇存槑絎︼紝鐢ㄦ潵琛ㄧず璺寵繃瀹冪浉搴旂殑鏁版嵁銆備緥濡傦細
scanf(“%2d%*3d%2d”,&a,&b);
濡傛灉杈撳叆濡備笅淇℃伅錛?234567銆傚皢12璧嬬粰a錛?7璧嬬粰b銆傜浜屼釜鏁版嵁”345”琚煩榪囦笉璧嬬粰浠諱綍鍙橀噺銆?br>鈶h緭鍏ユ暟鎹椂涓嶈兘瑙勫畾綺懼害錛屼緥濡傦細
scanf(“%7.2f”,&a);
鏄笉鍚堟硶鐨勶紝涓嶈兘浼佸浘杈撳叆錛?2345.67鑰屼嬌a鐨勫間負12345.67銆?br>
錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞鐩稿叧錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛?br>杈撳叆鏁版嵁嫻佸垎闅?br>鈶犳牴鎹牸寮忓瓧絎︾殑鍚箟浠庤緭鍏ユ祦涓彇寰楁暟鎹紝褰撹緭鍏ユ祦涓暟鎹被鍨嬩笌鏍煎紡瀛楃瑕佹眰涓嶇鏃訛紝灝辮涓鴻繖涓欏圭粨鏉熴傚錛?br>scanf(“%d%c%f”,&a,&b,&c)錛?br>濡傛灉杈撳叆濡備笅淇℃伅錛?br>1234r1234.567
鍒檚canf鍑芥暟鍦ㄦ帴鏀舵暟鎹椂鍙戠幇”r”綾誨瀷涓嶅尮閰嶏紝浜庢槸鎶?#8221;1234”杞崲鎴愭暣鍨嬭祴鍊肩粰a錛屾妸”r”璧嬬粰鍙橀噺b錛屾渶鍚庢妸”1234.567”杞崲鎴愬疄鍨嬫暟鎹祴緇檆銆?br>鈶℃牴鎹牸寮忛」涓寚瀹氱殑鍩熷鍒嗛殧鍑烘暟鎹」銆傚璇彞錛歴canf(“%2d%3f%4f”,&a,&b,&c);
濡傛灉杈撳叆濡備笅淇℃伅錛?br>123456789012345
鍒檚canf鍑芥暟鍦ㄦ帴鏀舵暟鎹椂鏍規嵁鍩熷鎶?2璧嬪肩粰a,345璧嬪肩粰b錛?789璧嬪肩粰c銆?br>鈶㈤殣紺哄垎闅旂銆傜┖鏍箋佽煩鏍肩錛?#8217;\t’錛夈佹崲琛岀錛?#8217;\n’錛夐兘鏄疌璇█璁ゅ畾鐨勬暟鎹垎闅旂銆?br>鈶f樉紺哄垎闅旂銆傚湪scanf鍑芥暟鐨勪袱涓牸寮忚鏄庨」闂存湁涓涓垨澶氫釜鏅氬瓧絎︼紝閭d箞鍦ㄨ緭鍏ユ暟鎹椂錛屽湪涓や釜鏁版嵁涔嬮棿涔熷繀欏諱互榪欎竴涓垨澶氫釜瀛楃鍒嗛殧銆傚璇彞錛?br>scanf(“a=%d,b=%f,c=%f”,&a,&b,&c);
鍒欒緭鍏ユ暟鎹簲璇ヤ負錛?br> a=1234,b=67.8,c=98.123
錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛嶏紞錛?br>鍏充簬scanf鍑芥暟鐨勮繘涓姝ヨ鏄庯細
鈶爏canf鍑芥暟涓殑“鏍煎紡鎺у埗”鍚庨潰搴斿綋鏄彉閲忓湴鍧錛岃屼笉搴旀槸鍙橀噺鍚嶃備緥濡傦紝濡傛灉a銆乥涓烘暣鍨嬪彉閲忥紝鍒?br>scanf(“%d,%d”,a,b);
鏄笉瀵圭殑錛屽簲灝?#8221;a錛宐”鏀逛負”&a,&b”銆?br>鈶″鏋滃湪“鏍煎紡鎺у埗”瀛楃涓蹭腑闄や簡鏍煎紡璇存槑浠ュ榪樻湁鍏跺畠瀛楃錛屽垯鍦ㄨ緭鍏ユ暟鎹椂搴旇緭鍏ヤ笌榪欎簺瀛楃鐩稿悓鐨勫瓧絎︺備緥濡傦細
scanf(“%d,%d”,&a,&b);
杈撳叆鏃跺簲杈撳叆錛?錛?銆?涓?涔嬮棿鐨勯楀彿搴斾笌scanf鍑芥暟涓殑“鏍煎紡鎺у埗”涓殑閫楀彿鐩稿搴旓紝杈撳叆鍏跺畠絎﹀彿鏄笉瀵圭殑銆?br>鈶㈠湪鐢?#8220;%c”鏍煎紡杈撳叆瀛楃鏃訛紝絀烘牸瀛楃鍜岃漿涔夊瓧絎﹂兘浣滀負鏈夋晥瀛楃杈撳叆銆?br>scanf(“%c%c%c”,&c1,&c2,&c3);
濡傝緭鍏ワ細a b c 銆傚瓧絎?#8217;a’璧嬬粰c1,瀛楃錛堢┖鏍鹼級’ ’璧嬬粰c2,瀛楃’b’ 璧嬬粰c3銆?br>鈶?scanf 涓笉浣跨敤U璇存槑絎?瀵箄nsigned鍨嬫暟鎹敤d銆乷銆亁璇存槑絎﹁緭鍏?