为什么printf("%d\n",sizeof(a)) 结果输出=4？ 为什么sizeof输出为4？
main() { printf("%d\n",sizeof('c')); } \u4e3a\u4ec0\u4e48\u7ed3\u679c\u662f4\u4e0d\u662f1char\u662f\u5b57\u7b26\u578b\uff0c\u4f46\u662f\u7531\u4e8e\u4e0d\u540c\u7684\u5e73\u53f0\u4e0b\uff0c\u6709\u7684\u7f16\u8bd1\u5668\u5bf9\u7a0b\u5e8f\u505a\u51fa\u4e86\u9002\u5f53\u7684\u4f18\u5316\uff0c\u9020\u6210\u7ed3\u679c\u53ef\u80fd\u5b58\u5728\u5dee\u5f02\uff0c\u4f8b\u5982\uff1a
char\u7c7b\u578b\u5360 1\u4e2a\u5b57\u8282\uff0c\u572832\u4f4d\u7684\u7cfb\u7edf\u4e0b\uff0c\u6bcf32\u4e2abit\uff0c\u4e5f\u5c31\u662f4\u4e2a\u5b57\u8282\u4e3a\u4e00\u4e2a\u57fa\u672c\u5bfb\u5740\u5355\u4f4d\uff0c\u6240\u4ee5\u5f53\u4f60\u4e0b\u4e00\u4e2a\u53d8\u91cf\u5b9a\u4e49\u65f6\uff0c\u4e0d\u7ee7\u7eed\u5728\u8fd9\u4e2achar\u7684\u53d8\u91cf\u540e\u9762\u5b9a\u4e49\uff0c\u800c\u662f\u5728\u4e0b\u4e00\u4e2a4\u4e2a\u5b57\u8282\u7684\u5355\u4f4d\u5f00\u59cb\u5904\u5b9a\u4e49\uff0c\u5c31\u9020\u6210\u524d\u4e00\u4e2achar\u53d8\u91cf\u540e\u5b58\u57283\u4e2a\u5b57\u8282\u7684 \u7a7a\u767d\u3002
\u6709\u4e9b\u7f16\u8bd1\u5668\u505a\u51fa\u4e86\u4f18\u5316\u53ef\u80fd\u5c06\u5176\u76f4\u63a5\u5728\u524d\u4e00\u4e2a\u53d8\u91cf\u540e\u5b9a\u4e49\u4ee5\u8282\u7701\u5185\u5b58\uff0c\u8fd9\u6837\u5c31\u662f1\u4e2a\u5b57\u8282\u4e86\u3002
\u603b\u7684\u6765\u8bf4\uff0c\u53ef\u80fd\u7531\u4e8e\u7f16\u8bd1\u5668\u3001\u7cfb\u7edf\u7684\u5dee\u5f02\u5bfc\u81f4\u7ed3\u679c\u6709\u6240\u5dee\u522b\uff0c\u4f60\u53ef\u4ee5\u5c06\u5176\u4fee\u6539\u4e3a sizeof(char) \u518d\u770b\u770b\u3002
\u56e0\u4e3a\u51fd\u6570f\u7684\u53c2\u6570\u867d\u7136\u662fchar s[]\uff0c\u4f46\u5b9e\u9645\u4e0a\u5c31\u662f\u4e2achar* s\uff0csizeof(\u4e00\u4e2a\u6307\u9488)\u572832\u4f4d\u673a\u5668\u4e0a\u90fd\u662f4
亲，这个你得去看看了，a在形参中只是一个指针变量，占的内存大小为4字节绛旓細include<stdio.h>int main(){ int a=1,b=2,C=3; ++a; C+=++b; { int b=4,C; C=b*3; a+=C; printf("first:%d,%d,%d\n",a,b,C); a+=C; printf("second:%d,%d,%d\n",a,b,C); } printf("third:%d,%d,%d\n",a,b,C); return(0);}...
绛旓細printf("\n");鏄釜鎹㈣锛孿n鏄浆涔夊瓧绗︼紝琛ㄧず鎹㈣ printf("%d",a);瀹屾暣搴旇杩欎箞鐢紝a鏄綘瑕佽緭鍑虹殑鍙橀噺鍚嶃%d鏄釜鍗犱綅绗︼紝瀹冧负涓涓猧nt鍨嬫暟鎹珯浣嶏紝涓涓猵rintf涓彲浠ユ湁澶氫釜鍗犱綅绗︺傚锛歱rintf("%d%d%f",x,y,z);f涔熸槸鍗犱綅绗︼紝瀹冧负float鍨嬫暟鎹珯浣嶏紝鍗犱綅绗︾殑瀵瑰簲鍏崇郴鏄『搴忓搴旂殑锛屽嵆绗嚑涓崰浣...
绛旓細杩欐槸瀵圭殑锛printf()鐨勭涓涓弬鏁颁笉鏄牸寮忔帶鍒剁鍚楋紝姣斿int a=1; printf(" %d ",a);鍏朵腑%d灏辫〃绀烘暣鍨嬶紝鎵浠rintf("%"); 灏变細鏈夎鍛娿傚鏋滄槸printf("\%");涔熶笉琛屻傚彧鏈塸rintf("%%");灏辫〃绀鸿緭鍑%銆傛瘮濡俻rintf("%%d");鐨勮緭鍑哄氨鏄%d....
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绛旓細printf()鍑芥暟鏄牸寮忓寲杈撳嚭鍑芥暟, 涓鑸敤浜庡悜鏍囧噯杈撳嚭璁惧鎸夎瀹氭牸寮忚緭鍑轰俊鎭俻rintf()鍑芥暟鐨勮皟鐢ㄦ牸寮忎负: printf("<鏍煎紡鍖栧瓧绗︿覆>", <鍙傞噺琛>)銆傛牸寮忚緭鍑,瀹冩槸c璇█涓骇鐢熸牸寮忓寲杈撳嚭鐨勫嚱鏁(鍦 stdio.h 涓畾涔)銆傜敤浜庡悜缁堢(鏄剧ず鍣ㄣ佹帶鍒跺彴绛)杈撳嚭瀛楃銆傛牸寮忔帶鍒剁敱瑕佽緭鍑虹殑鏂囧瓧鍜屾暟鎹牸寮忚鏄庣粍鎴愩傝杈撳嚭鐨勭殑鏂囧瓧...
绛旓細"\n"锛欳璇█涓殑鎹㈣绗︽槸"\n"锛屽氨鏄緭鍏ュ畬涓琛屽唴瀹瑰悗锛屽厜鏍囪浆鍒颁笅涓琛岀殑璧峰浣嶇疆 銆備笉鍔犫淺n鈥濆杈撳嚭鐨勫瓧绗︼紝瀛楃涓诧紝鏁板瓧绛夋病鏈夊奖鍝嶏紝浣嗘槸杈撳嚭鐭╅樀鐨勬椂鍊欒鍔犫淺n鈥濄備緥濡傦細printf("first line\n");printf("second line\n");鎹㈣绗︼紙line break锛夋槸鎸囦竴绉嶈绠楁満璇█琛ㄨ揪鏂瑰紡锛屽畠鐨勪綔鐢ㄦ槸璁...
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