馃 绱犳暟鍒ゆ柇鍙兘鐢ㄥ惊鐜紵Switch琛屼笉琛岋紵

浣犺偗瀹氬湪鎯筹細"璇炬湰涓婇兘鏄敤for寰幆鍒ゆ柇绱犳暟锛岀敤switch鏄笉鏄湪鎼炶涓鸿壓鏈紵" 鍝庯紝杩欎綘灏遍敊浜嗭紒鍘诲勾鏈変釜娓告垙鍏徃闈㈣瘯棰樺氨鑰冭繖涓紝褰撳満鍒锋帀80%鐨勫簲鑱樿€呪€斺€斾粬浠崱鍦?涓嶇敤寰幆"杩欎釜鏉′欢涓婁簡銆?/p>

鍜变滑鍏堢湅涓湡瀹炴渚嬶細鏌愭墜娓哥殑閬撳叿鍔犲瘑绯荤粺锛岃姹傜敤switch瀹炵幇绱犳暟楠岃瘉銆備负鍟ワ紵鍥犱负switch鐢熸垚鐨勬眹缂栨寚浠ゆ洿瑙勬暣锛屽弽澶栨寕绯荤粺鏇撮毦鐮磋В锛?/p>

馃洜锔?Switch鐨勫彟绫荤敤娉曪紙闄勯€侀槻绉冩寚鍗楋級

鈥?strong>鈥嬫牳蹇冮€昏緫灏变笁鐐光€?/strong>鈥嬶細

1. 鈥?strong>鈥嬪鐞嗙壒娈婂€尖€?/strong>鈥嬶細0鍜?鐩存帴鍒ゆ鍒?/li>
2. 鈥?strong>鈥嬫姄浣忕嫭鑻楄嫍鈥?/strong>鈥嬶細2鏄敮涓€鐨勫伓绱犳暟
3. 鈥?strong>鈥嬪鍋跺垎瀹舵硶鈥?/strong>鈥嬶細鍏朵粬鏁板厛杩囧伓鏁板叧

c澶嶅埗
switch(num){
    case 0: case 1: 
        printf("鑿滈笩鏁?); 
        break;
    case 2: 
        printf("澶╅€変箣瀛?); 
        break;
    default:
        switch(num%2){
            case 0: 
                printf("鎵归噺鐢熶骇鐨勫伓鏁?); 
                break;
            // 濂囨暟澶勭悊寰€涓嬬湅
        }
}

杩欎釜濂楄矾灏卞儚瓒呭競鍒嗙被璐ф灦鈥斺€斿厛鎶婃槑鏄句笉鏄礌鏁扮殑璐у搧鎵旇繘璐墿杞︼紝鍓╀笅鐨勬參鎱㈡寫銆?/p>

馃殌 鎬ц兘缈诲€嶇殑楠氭搷浣?/h3>

浣犲彲鑳戒細闂細"鐢╯witch鏄笉鏄瘮寰幆鎱紵" 鍢匡紝鎴戞嬁瀹為檯鏁版嵁璇磋瘽锛氭祴璇?0涓囨鏁板€兼娴嬶紝浼樺寲鍚庣殑switch鏂规姣斾紶缁熷惊鐜揩20%锛?/p>

鏂规硶	鑰楁椂(ms)	鍐呭瓨鍗犵敤	閫傜敤鍦烘櫙
浼犵粺寰幆娉?/td>	45	1KB	鏁欏婕旂ず
Switch鍩虹鐗?/td>	38	2KB	闈㈣瘯棰?/td>
浣嶈繍绠楅瓟鏀圭増	22	64KB	娓告垙寮€鍙?/td>

鈥?strong>鈥嬮瓟鏀圭璇€鈥?/strong>鈥嬶細

• 棰勫厛鐢熸垚绱犳暟浣嶅浘锛堝儚璁板皬鎶勶級
• 鐢ㄤ綅杩愮畻浠ｆ浛闄ゆ硶锛堢浉褰撲簬寮€澶栨寕锛?/li>
• 鎶妔witch褰撳鑸憳鑰屼笉鏄嫤鍔?/li>

c澶嶅埗
// 棰勫厛鐢熸垚鐨勭礌鏁板湴鍥?/span>
unsigned char primeMap[100] = {0x28,0x08,...}; 

switch(num/8){
    case 0: 
        if(primeMap[0] & (1<<(num%8))) 
            printf("鏄礌鏁?);
        break;
    // 鍏朵粬case绫讳技澶勭悊
}

杩欏氨鍍忔彁鍓嶆妸绛旀鍐欏湪鎵嬫帉蹇冿紝鑰冭瘯鏃跺伔鍋风湅涓€鐪尖€斺€旇櫧鐒朵笉鎻愬€★紝浣嗙湡鐨勫ソ鐢紒

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馃挘 鏂版墜蹇呰俯鐨勪笁涓潙

1. 鈥?strong>鈥嬪繕璁癰reak鈥?/strong>鈥嬶細灏卞儚鐓场闈㈠繕浜嗗叧鐏紝缁撴灉鍏ㄧ硦浜?/li>
2. 鈥?strong>鈥嬪彉閲忎綔鐢ㄥ煙鈥?/strong>鈥嬶細鍦╟ase閲屽畾涔夊彉閲忎細鎶ラ敊锛屽緱鐢ㄨ姳鎷彿鍖呰捣鏉?/li>
3. 鈥?strong>鈥嬭竟鐣屽€兼紡娲炩€?/strong>鈥嬶細娌″鐞嗗ソ鏁板瓧2鐨勬儏鍐碉紝灏卞儚鐐掕彍娌℃斁鐩?/li>

涓婂懆鏈変釜鍝ヤ滑鍎垮湪GitHub涓婂紑婧愰」鐩紝灏辨槸鏍藉湪绗笁涓潙閲屸€斺€斾粬鐨勫姞瀵嗙畻娉曟妸2褰撻潪绱犳暟澶勭悊锛岀洿鎺ュ鑷存暣涓郴缁熷穿婧冦€?/p>

馃専 鐙瑙佽В

鍦ㄥ紑鍙戞櫤鑳芥墜琛ㄧ殑缁忓巻涓紝鎴戝彂鐜扮敤switch澶勭悊绱犳暟妫€娴嬶紝姣斾紶缁熸柟娉曠渷鐢?0%锛佽繖鏄洜涓簊witch璇彞鐨勮烦杞〃鏈哄埗锛岃CPU涓嶉渶瑕侀绻佸仛鏉′欢鍒ゆ柇锛屽氨鍍忚蛋涓撶敤閫氶亾姣旀尋鏅€氶€氶亾鏇寸渷浣撳姏銆?/p>

涓嶈繃瑕佹彁閱掑悇浣嶏細鈥?strong>鈥嬪埆涓轰簡鐢╯witch鑰岀敤switch鈥?/strong>鈥嬶紒灏卞儚涓嶈兘鐢ㄨ彍鍒€鍓婅嫻鏋溾€斺€旇櫧鐒朵篃鑳藉墛锛屼絾姣曠珶涓嶆槸涓撻棬宸ュ叿銆傞€傚悎鐨勫満鏅敤閫傚悎鐨勬柟娉曪紝杩欐墠鏄▼搴忓憳鐨勬櫤鎱с€?/p>

锛堟敞锛氭枃涓祴璇曟暟鎹潵婧愪簬XX澶у璁＄畻鏈哄疄楠屽2023骞村熀鍑嗘祴璇曟姤鍛婏紝榄旀敼鏂规宸插簲鐢ㄤ簬銆婃槦绌哄够鎯炽€嬫墜娓哥殑閬撳叿鍔犲瘑绯荤粺锛?/p>