锘??xml version="1.0" encoding="utf-8" standalone="yes"?>国产欧美久久一区二区,欧洲成人午夜精品无码区久久,无码日韩人妻精品久久蜜桃http://www.shnenglu.com/jianjianxiaole/category/12903.htmlzh-cnSun, 26 Dec 2010 08:31:45 GMTSun, 26 Dec 2010 08:31:45 GMT60嫻偣鏁扮殑琛ㄧず鑼冨洿http://www.shnenglu.com/jianjianxiaole/articles/float.html鏈涜鏈涜Sun, 26 Dec 2010 07:44:00 GMThttp://www.shnenglu.com/jianjianxiaole/articles/float.htmlhttp://www.shnenglu.com/jianjianxiaole/comments/137500.htmlhttp://www.shnenglu.com/jianjianxiaole/articles/float.html#Feedback0http://www.shnenglu.com/jianjianxiaole/comments/commentRss/137500.htmlhttp://www.shnenglu.com/jianjianxiaole/services/trackbacks/137500.html涓涓誕鐐規(guī)暟錛團loating Point Number錛夌敱涓変釜鍩烘湰鎴愬垎鏋勬垚錛氱鍙鳳紙Sign錛夈侀樁鐮侊紙Exponent錛夊拰灝炬暟錛圡antissa錛夈?br>銆銆閫氬父錛屽彲浠ョ敤涓嬮潰鐨勬牸寮忔潵琛ㄧず嫻偣鏁幫細
S P M
銆銆鍏朵腑S鏄鍙蜂綅錛孭鏄樁鐮侊紝M鏄熬鏁般?br>銆銆鏍規(guī)嵁IEEE錛堢編鍥界數(shù)姘斿拰鐢?shù)瀛愬伐绋嬪笀瀛︿細锛?54鏍囧噯涓殑瀹氫箟錛屽崟綺懼害錛圫ingle Precision錛夋誕鐐規(guī)暟鏄?2浣嶏紙鍗?瀛楄妭錛夌殑錛屽弻綺懼害錛圖ouble Precision錛夋誕鐐規(guī)暟鏄?4浣嶏紙鍗?瀛楄妭錛夌殑銆備袱鑰呯殑S銆丳銆丮鎵鍗犵殑浣嶆暟浠ュ強琛ㄧず鏂規(guī)硶鐢變笅琛ㄥ彲鐭ワ細
S P M 琛ㄧず鍏紡 鍋忕Щ閲?/td>

鍗曠簿搴︽誕鐐規(guī)暟

1錛堢31浣嶏級

8錛?0鍒?3浣嶏級

23錛?2鍒?浣嶏級

(-1)^S*2(P-127)*1.M

127

鍙岀簿搴︽誕鐐規(guī)暟

1錛堢63浣嶏級

11錛?2鍒?2浣嶏級

52錛?1鍒?浣嶏級

(-1)^S*2(P-1023)*1.M

1023
銆銆鍏朵腑S鏄鍙蜂綅錛屽彧鏈?鍜?錛屽垎鍒〃紺烘璐熴?br>銆銆P鏄樁鐮侊紝閫氬父浣跨敤縐葷爜琛ㄧず錛堢Щ鐮佸拰琛ョ爜鍙湁絎﹀彿浣嶇浉鍙嶏紝鍏朵綑閮戒竴鏍楓傚浜庢鏁拌岃█錛屽師鐮併佸弽鐮佸拰琛ョ爜閮戒竴鏍鳳紱瀵逛簬璐熸暟鑰岃█錛岃ˉ鐮佸氨鏄叾緇濆鍊肩殑鍘熺爜鍏ㄩ儴鍙栧弽錛岀劧鍚庡姞1錛夈傞樁鐮佸彲浠ヤ負姝f暟錛屼篃鍙互涓鴻礋鏁幫紝涓轟簡澶勭悊璐熸寚鏁扮殑鎯呭喌錛屽疄闄呯殑鎸囨暟鍊兼寜瑕佹眰闇瑕佸姞涓婁竴涓亸宸紙Bias錛夊間綔涓轟繚瀛樺湪鎸囨暟鍩熶腑鐨勫鹼紝鍗曠簿搴︽暟鐨勫亸宸間負127錛屽弻綺懼害鏁扮殑鍋忓樊鍊間負1023銆備緥濡傦紝鍗曠簿搴︾殑瀹為檯鎸囨暟鍊?鍦ㄦ寚鏁板煙涓皢淇濆瓨涓?27錛岃屼繚瀛樺湪鎸囨暟鍩熶腑鐨?4鍒欒〃紺哄疄闄呯殑鎸囨暟鍊?63錛屽亸宸殑寮曞叆浣垮緱瀵逛簬鍗曠簿搴︽暟錛屽疄闄呭彲浠ヨ〃杈劇殑鎸囨暟鍊肩殑鑼冨洿灝卞彉鎴?127鍒?28涔嬮棿錛堝寘鍚袱绔級銆?br>銆銆M涓哄熬鏁幫紝鍏朵腑鍗曠簿搴︽暟涓?3浣嶉暱錛屽弻綺懼害鏁頒負52浣嶉暱銆侷EEE鏍囧噯瑕佹眰嫻偣鏁板繀欏繪槸瑙勮寖鐨勩傝繖鎰忓懗鐫灝炬暟鐨勫皬鏁扮偣宸︿晶蹇呴』涓?錛屽洜姝ゅ湪淇濆瓨灝炬暟鐨勬椂鍊欙紝鍙互鐪佺暐灝忔暟鐐瑰墠闈㈣繖涓?錛屼粠鑰岃吘鍑轟竴涓簩榪涘埗浣嶆潵淇濆瓨鏇村鐨勫熬鏁般傝繖鏍峰疄闄呬笂鐢?3浣嶉暱鐨勫熬鏁板煙琛ㄨ揪浜?4浣嶇殑灝炬暟銆備緥濡傚浜庡崟綺懼害鏁拌岃█錛屼簩榪涘埗鐨?001.101錛堝搴斾簬鍗佽繘鍒剁殑9.625錛夊彲浠ヨ〃杈句負1.001101 × 23錛屾墍浠ュ疄闄呬繚瀛樺湪灝炬暟鍩熶腑鐨勫間負00110100000000000000000錛屽嵆鍘繪帀灝忔暟鐐瑰乏渚х殑1錛屽茍鐢?鍦ㄥ彸渚цˉ榻愩?br>銆銆鏍規(guī)嵁鏍囧噯瑕佹眰錛屾棤娉曠簿紜繚瀛樼殑鍊煎繀欏誨悜鏈鎺ヨ繎鐨勫彲淇濆瓨鐨勫艱繘琛岃垗鍏ワ紝鍗充笉瓚充竴鍗婂垯鑸嶏紝涓鍗婁互涓婏紙鍖呮嫭涓鍗婏級鍒欒繘銆備笉榪囧浜庝簩榪涘埗嫻偣鏁拌岃█錛岃繕澶氫竴鏉¤鐭╋紝灝辨槸褰撻渶瑕佽垗鍏ョ殑鍊煎垰濂芥槸涓鍗婃椂錛屼笉鏄畝鍗曞湴榪涳紝鑰屾槸鍦ㄥ墠鍚庝袱涓瓑璺濇帴榪戠殑鍙繚瀛樼殑鍊間腑錛屽彇鍏朵腑鏈鍚庝竴浣嶆湁鏁堟暟瀛椾負闆惰呫?br>銆銆鎹互涓婂垎鏋愶紝IEEE 754鏍囧噯涓畾涔夋誕鐐規(guī)暟鐨勮〃紺鴻寖鍥翠負錛?/div>

浜岃繘鍒訛紙Binary錛?/p>

鍗佽繘鍒訛紙Decimal錛?/p>

鍗曠簿搴︽誕鐐規(guī)暟

± (2-2^-23) × 2127

~ ± 10^38.53

鍙岀簿搴︽誕鐐規(guī)暟

± (2-2^-52) × 21023

~ ± 10^308.25

銆銆嫻偣鏁扮殑琛ㄧず鏈変竴瀹氱殑鑼冨洿錛岃秴鍑鴻寖鍥存椂浼氫駭鐢熸孩鍑猴紙Flow錛夛紝涓鑸О澶т簬緇濆鍊兼渶澶х殑鏁版嵁涓轟笂婧紙Overflow錛夛紝灝忎簬緇濆鍊兼渶灝忕殑鏁版嵁涓轟笅婧紙Underflow錛夈?br>浜屻佹誕鐐規(guī)暟鐨勮〃紺虹害瀹?br>銆銆鍗曠簿搴︽誕鐐規(guī)暟鍜屽弻綺懼害嫻偣鏁伴兘鏄敤IEEE 754鏍囧噯瀹氫箟鐨勶紝鍏朵腑鏈変竴浜涚壒孌婄害瀹氾紝渚嬪錛?br>銆銆1銆佸綋P=0錛孧=0鏃訛紝琛ㄧず0銆?br>銆銆2銆佸綋P=255錛孧=0鏃訛紝琛ㄧず鏃犵┓澶э紝鐢ㄧ鍙蜂綅鏉ョ‘瀹氭槸姝f棤絀峰ぇ榪樻槸璐熸棤絀峰ぇ銆?br>銆銆3銆佸綋P=255錛孧≠0鏃訛紝琛ㄧずNaN錛圢ot a Number錛屼笉鏄竴涓暟錛夈?br>涓夈侀潪瑙勮寖嫻偣鏁?br>銆銆褰撲袱涓粷瀵瑰兼瀬灝忕殑嫻偣鏁扮浉鍑忓悗錛屽叾宸肩殑鎸囨暟鍙兘瓚呭嚭鍏佽鑼冨洿錛屾渶緇堝彧鑳借繎浼間負0銆備負浜嗚В鍐蟲綾婚棶棰橈紝IEEE鏍囧噯涓紩鍏ヤ簡闈炶鑼冿紙Denormalized錛夋誕鐐規(guī)暟錛岃瀹氬綋嫻偣鏁扮殑鎸囨暟涓哄厑璁哥殑鏈灝忔寚鏁板兼椂錛屽熬鏁頒笉蹇呮槸瑙勮寖鍖栵紙Normalized錛夌殑銆傛湁浜嗛潪瑙勮寖嫻偣鏁幫紝鍘繪帀浜嗛殣鍚殑灝炬暟浣嶇殑鍒剁害錛屽彲浠ヤ繚瀛樼粷瀵瑰兼洿灝忕殑嫻偣鏁般傝屼笖錛岀敱浜庝笉鍐嶅彈鍒伴殣鍚熬鏁板煙鐨勫埗綰︼紝涓婅堪鍏充簬鏋佸皬宸肩殑闂涔熶笉瀛樺湪浜嗭紝鍥犱負鎵鏈夊彲浠ヤ繚瀛樼殑嫻偣鏁頒箣闂寸殑宸煎悓鏍峰彲浠ヤ繚瀛樸?br>銆銆鏍規(guī)嵁IEEE 754鏍囧噯涓殑瀹氫箟錛岃鑼冨拰闈炶鑼冩誕鐐規(guī)暟鐨勮〃紺鴻寖鍥村彲褰掔撼涓轟笅琛細

瑙勮寖嫻偣鏁?/p>

闈炶鑼冩誕鐐規(guī)暟

鍗佽繘鍒惰繎浼艱寖鍥?/p>

鍗曠簿搴︽誕鐐規(guī)暟

± 2^-149 鑷?(1-2^-23)*2^-126

± 2^-126 鑷?(2-2^-23)*2^127

± ~10^-44.85 鑷?~10^38.53

鍙岀簿搴︽誕鐐規(guī)暟

± 2^-1074 鑷?(1-2^-52)*2^-1022

± 2^-1022 鑷?(2-2^-52)*2^1023

± ~10^-323.3 鑷?~10^308.3

鍥涖佷笌IEEE 754鐩稿叧鐨勬爣鍑?br>銆銆鏈枃鐨勭粨璁哄熀浜嶪EEE 754鏍囧噯錛屽彟澶栦竴涓爣鍑嗘槸IEEE 854錛岃繖涓爣鍑嗘槸鍏充簬鍗佽繘鍒舵誕鐐規(guī)暟鐨勶紝浣嗘病鏈夎瀹氬叿浣撴牸寮忥紝鎵浠ュ緢灝戣閲囩敤銆傚彟澶栵紝浠?000騫村紑濮嬶紝IEEE 754寮濮嬩慨璁紝琚О涓篒EEE 754R錛岀洰鐨勬槸铻嶅悎IEEE 754鍜孖EEE 854鏍囧噯銆傝鏍囧噯鍦ㄦ誕鐐規(guī)牸寮忔柟闈㈢殑淇鏈夛細1銆佸姞鍏ヤ簡16浣嶅拰128浣嶇殑浜岃繘鍒舵誕鐐規(guī)暟鏍煎紡錛?銆佸姞鍏ヤ簡鍗佽繘鍒舵誕鐐規(guī)暟鏍煎紡錛岄噰鐢ㄤ簡IBM鍏徃鎻愬嚭鐨勬牸寮忋?/div>


鏈涜 2010-12-26 15:44 鍙戣〃璇勮
]]>C璇█浜岄噸鎸囬拡鐨勮繍鐢?/title><link>http://www.shnenglu.com/jianjianxiaole/articles/106489.html</link><dc:creator>鏈涜</dc:creator><author>鏈涜</author><pubDate>Tue, 26 Jan 2010 14:27:00 GMT</pubDate><guid>http://www.shnenglu.com/jianjianxiaole/articles/106489.html</guid><wfw:comment>http://www.shnenglu.com/jianjianxiaole/comments/106489.html</wfw:comment><comments>http://www.shnenglu.com/jianjianxiaole/articles/106489.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.shnenglu.com/jianjianxiaole/comments/commentRss/106489.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/jianjianxiaole/services/trackbacks/106489.html</trackback:ping><description><![CDATA[  <p><span>銆庢憳瑕併忔湰鏂囦富瑕侀氳繃瀹炰緥灞曠ず</span><span>C/C++</span><span>涓簩閲嶆寚閽堢殑鐢ㄦ硶鍜岀敤閫旓紝瀵逛簬璇稿浜屽弶鏍?wèi)绛夐掑綊瀹氫箟鐨勬暟鎹粨鏋勬湁涓瀹氱殑鎸囧浣滅敤</span><span> </span><span>銆?/span></p> <p><span>銆愬叧閿瓧銆戯細<span>C/C++</span>銆佷簩閲嶆寚閽堛侀掑綊</span></p> <p><span>鏈漢鏈榪戞兂瀹炵幇涓涓?span>B+</span>鏍?wèi)锛岃櫧鐒跺?span>B+</span>鏍?wèi)鐨勭悊璁烘湁涓瀹氱殑璁よ瘑錛屼絾鐢變簬鑰冪爺鑺卞幓澶ч噺鏃墮棿澶嶄範(fàn)鍔熻錛屽<span>C</span>鐨勪竴浜涚粏鑺傛湁鎵閬楀繕錛屽洜姝ゅ喅瀹氫粠浜屽弶鏍?wèi)鐨勫疄鐜板紑濮嬨備絾鍒氬啓瀹屼簩鍙夋爲(wèi)鐨勫垱寤哄嚱鏁頒笖鍦ㄧ紪璇戦氳繃涔嬪悗錛岃皟璇曟椂鍗村嚭鐜頒簡闂銆備簩鍙夋爲(wèi)鏄竴縐嶉掑綊瀹氫箟鐨勬暟鎹粨鏋勶紝鍥犳鍏跺垱寤哄嚱鏁頒篃蹇呭畾鏄掑綊鐨勩傚叾鍒涘緩鍑芥暟鎻忚堪濡備笅錛?br></span></p> <p><img border=0 alt="" src="http://www.shnenglu.com/images/cppblog_com/jianjianxiaole/3.JPG" width=505 height=271></p> <p><span> <span>                 </span></span><span>鍥?span>1 </span>浜屽弶鏍?wèi)鍒涘缓鍑芥?/span></p> <p><span>鐞嗚涓婃病鏈夐敊璇紝鍚屾椂鍦ㄥ垱寤轟簩鍙夋爲(wèi)鏃朵篃鑳芥垚鍔燂紝浣嗛氳繃鏈漢緙栧啓鐨勫厛搴忛亶鍘嗚浜屽弶鏍?wèi)鏃跺Q屽嵈鏄劇ず<span>0</span>錛屽嵆絀虹殑浜屽弶鏍?wèi)锛岀浉鍏虫搷浣滀唬鐮佸涓嬪Q?/span></p> <p><span>//</span><span>鍏蜂綋鐨勬搷浣滄楠?/span></p> <p><span>TREE tree = 0; //TREE</span><span>涓轟簩鍙夋爲(wèi)緇撴瀯浣撶殑鎸囬拡鍨嬪埆</span></p> <p><span>createBinaryTree(tree);</span></p> <p><span>//</span><span>鍏堝簭閬嶅巻</span></p> <p><span>鐢變簬緇撴灉閿欒錛屽洜姝ゅ紑濮嬭皟璇曪紝閫氳繃瑙傚療鍙戠幇褰?span>createVinartTree(tree)</span>鎿嶄綔瀹屾垚鍚?span>tree</span>鐨勫睘鎬т粛鐒朵負<span>0</span>錛屽嵆浠嶇劧<span>tree=0</span>銆傚悗鏉ュ張閫氳繃浠旂粏鍒嗘瀽錛屽彂鐜伴棶棰樺嚭鍦ㄥ嚱鏁扮殑鍙傛暟涓娿傝櫧鐒惰鍑芥暟浼犲叆鐨勬槸鎸囬拡鍨嬪埆錛屽睘浜庡疄鍙傦紝浣嗘槸璇ュ嚱鏁板唴閮ㄤ富瑕佷互鍘熸寚閽堜綔涓烘搷浣滃璞★紝鍥犳鐩稿浜庢寚閽堟潵璇達紝浼犲叆鐨勫彧鏄粨鏋勪綋鎸囬拡鐨勫艦鍙傘傛墍浠ワ紝鍦ㄥ嚱鏁板唴閮ㄦ搷浣滅殑鍙槸涓涓壇鏈紝鍥犳浜屽弶鏍?wèi)鐨勫垱寰忓まp觸銆?/span></p> <p><span>涓轟簡瑙e喅榪欎釜闂錛岀瑪鑰呭喅瀹氶獙璇佽嚜宸辯殑鎯蟲硶鏄惁姝g‘錛屼簬鏄啓浜嗗涓嬩竴孌墊祴璇曚唬鐮?span>,</span>浠g爜濡備笅錛?/span></p> <p><span>//</span><span>鐗堟湰<span>1</span></span></p> <p><span>typedef struct student {</span></p> <p><span><span>    </span>char* name;</span></p> <p><span><span>    </span>int age;</span></p> <p><span>}Student,*STUDENT;</span></p> <p> </p> <p><span>void getInstance(STUDENT s);</span></p> <p> </p> <p><span>int main(){</span></p> <p><span><span>    </span>Student* st = 0;</span></p> <p><span><span>    </span>printf("</span><span>鎸囬拡<span>st</span>鐨勫湴鍧<span>=%d\n",&st);</span></span></p> <p><span><span>    </span>getInstance(st);</span></p> <p><span><span>    </span>printf("st</span><span>鏂板疄渚嬬殑鍦板潃<span>=%d\n",st);</span></span></p> <p><span><span>    </span>return 1;</span></p> <p><span>}</span></p> <p><span>void getInstance(STUDENT s){</span></p> <p><span><span>    </span>printf("</span><span>鎸囬拡<span>S</span>鐨勫湴鍧<span> =%d\n",&s);</span></span></p> <p><span><span>    </span>s = (Student*)malloc(sizeof(student));</span></p> <p><span><span>    </span>printf("s</span><span>鏂板疄渚嬬殑鍦板潃<span>=%d\n",s);</span></span></p> <p><span>}</span></p> <p><span>榪欎釜鍑芥暟鐨勪紶鍊煎艦寮忎笌涔嬪墠浜屽弶鏍?wèi)鐨勫嚱鏁板樊涓嶅锛屽洜姝ゅ彲浠ゾc繪瘮錛屽叿浣撹繍琛屼箣鍚庡緱鍒扮殑璁拌繃鏄紙濡傚浘錛夛細</span></p> <p><img border=0 alt="" src="http://www.shnenglu.com/images/cppblog_com/jianjianxiaole/1.JPG" width=376 height=106></p> <p><span>鍥?span>2 </span>鐗堟湰<span>1</span>鐨勮繍琛岀粨鏋?/span></p> <p> </p> <p><span>緇撴灉寰堟樉鐒訛紝鎸囬拡浼犲叆鍑芥暟涔嬪悗浜х敓浜嗕竴涓柊鐨勫壇鏈紝瀵瑰壇鏈殑浠諱綍鎿嶄綔錛岄兘涓嶄細褰卞搷鍒板師鎸囬拡鎸囧悜鐨勭粨鏋勪綋錛屼笌浜屽弶鏍?wèi)鍒涘缓澶辫触绫讳见|紝鐩殑鎸囬拡鐨勫壇鏈寚鍚戜簡鐩爣緇撴瀯浣擄紝浜х敓浜嗗唴瀛樻硠婕忋?/span></p> <p><span>榪欎釜闂鐨勮В鍐充篃鍗佸垎鐨勭畝鍗曪紝灝嗙粨鏋勪綋鐨勬寚閽堜綔涓哄疄鍙備紶鍏ュ嚱鏁板嵆鍙紝榪欐牱灝卞彲浠ョ洿鎺ユ搷浣滅洰鏍囨寚閽堬紝涔熷氨涓嶄細鍑虹幇閿欒鐨勭粨鏋溿傝繍鐢ㄤ簩閲嶆寚閽堝彲浠ヨ交鏉懼疄鐜幫紝鍏蜂綋淇敼濡備笅錛?/span></p> <p><span>//</span><span>鐗堟湰<span>2</span></span></p> <p><span>typedef struct student {</span></p> <p><span> char* name;</span></p> <p><span> int age;</span></p> <p><span>}Student<span>,<strong>**STUDENT</strong>;</span></span></p> <p> </p> <p><span>void getInstance(STUDENT s);</span></p> <p> </p> <p><span>int main(){</span></p> <p><span> Student* st = 0;</span></p> <p><span><span>    </span>printf("</span><span>鎸囬拡<span>st</span>鐨勫湴鍧<span>=%d\n",&st);</span></span></p> <p><span>  <strong>getInstance(&st);</strong></span></p> <p><span><span>    </span>printf("st</span><span>鏂板疄渚嬬殑鍦板潃<span>=%d\n",st);</span></span></p> <p><span> return 1;</span></p> <p><span>}</span></p> <p><span>void getInstance(STUDENT s){</span></p> <p><span> printf("</span><span>鎸囬拡<span>S</span>鐨勫湴鍧<span> =%d\n",s);</span></span></p> <p><span> <strong>*s = (Student*)malloc(sizeof(student));</strong></span></p> <p><span> <strong>printf("s</strong></span><strong><span>鏂板疄渚嬬殑鍦板潃<span>=%d\n",*s);</span></span></strong></p> <p><span>}</span></p> <p><span>淇敼閮ㄥ垎濡傞粦浣撻儴鍒嗘墍紺猴紝鍏蜂綋鐨勮繍琛岀粨鏋滃涓嬪浘錛?/span></p> <p><img border=0 alt="" src="http://www.shnenglu.com/images/cppblog_com/jianjianxiaole/2.JPG" width=365 height=105></p> <p><span> </span><span>鍥?span>3 </span>鐗堟湰<span>2</span>鐨勮繍琛岀粨鏋?/span></p> <p><span>嫻嬭瘯鎴愬姛錛屽嚱鏁板唴閮ㄦ搷浣滅殑鎸囬拡灝辨槸瀹為檯浼犲叆鐨勬寚閽堬紝鍗抽氳繃浜岄噸鎸囬拡瀹炵幇浜嗙洰鏍囨搷浣滄寚閽堢殑瀹炲弬浼犻掞紝鍥犳鑳借揪鍒伴鎯崇殑緇撴灉銆傝繖涔熻鏄庝簡浜岄噸鎸囬拡鐨勫疄闄呯敤澶勩?/span></p> <img src ="http://www.shnenglu.com/jianjianxiaole/aggbug/106489.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/jianjianxiaole/" target="_blank">鏈涜</a> 2010-01-26 22:27 <a href="http://www.shnenglu.com/jianjianxiaole/articles/106489.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item></channel></rss> <footer> 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