×Ö¡£ struct s1 { int i: 8; int j: 4; int a: 3; double b; }; struct s2 { int i: 8; int j: 4; double b; int a:3; }; printf("sizeof(s1)= %d\n", sizeof(s1)); printf("sizeof(s2)= %d\n", sizeof(s2)); result: 16, 24 µÚÒ»¸östruct s1 { int i: 8; int j: 4; int a: 3; double b; }; ÀíÂÛÉÏÊÇÕâÑùµÄ£¬Ê×ÏÈÊÇiÔÚÏà¶Ô0µÄλÖã¬Õ¼8λһ¸ö×Ö½Ú£¬È»ºó£¬j¾ÍÔÚÏà¶ÔÒ»¸ö×Ö½Ú µÄλÖã¬ÓÉÓÚÒ»¸öλÖõÄ×Ö½ÚÊýÊÇ4λµÄ±¶Êý£¬Òò´Ë²»ÓöÔÆ룬¾Í·ÅÔÚÄÇÀïÁË£¬È»ºóÊÇ a£¬ÒªÔÚ3λµÄ±¶Êý¹ØϵµÄλÖÃÉÏ£¬Òò´ËÒªÒÆһ룬ÔÚ15λµÄλÖÃÉÏ·ÅÏ£¬Ä¿Ç°×ܹ²ÊÇ18 룬ÕÛËã¹ýÀ´ÊÇ2×Ö½Ú2λµÄÑù×Ó£¬ÓÉÓÚdoubleÊÇ8 ×ֽڵģ¬Òò´ËÒªÔÚÏà¶Ô0ÒªÊÇ8¸ö×Ö½Ú µÄλÖÃÉÏ·ÅÏ£¬Òò´Ë´Ó18λ¿ªÊ¼µ½8¸ö×Ö½ÚÖ®¼äµÄλÖñ»ºöÂÔ£¬Ö±½Ó·ÅÔÚ8×Ö½ÚµÄλÖà ÁË£¬Òò´Ë£¬×ܹ²ÊÇ16×Ö½Ú¡£ µÚ¶þ¸ö×îºó»á¶ÔÕÕÊDz»ÊǽṹÌåÄÚ×î´óÊý¾ÝµÄ±¶Êý£¬²»ÊǵĻ°£¬»á²¹³ÉÊÇ×î´óÊý¾ÝµÄ±¶ Êý 1£©¶ÁÎļþfile1.txtµÄÄÚÈÝ£¨ÀýÈ磩£º 12 34 56 Êä³öµ½file2.txt£º 56 34 12 £¨ÄæÐò£© 2£©Êä³öºÍΪһ¸ö¸ø¶¨ÕûÊýµÄËùÓÐ×éºÏ ÀýÈçn=5 5=1+4£»5=2+3£¨Ïà¼ÓµÄÊý²»ÄÜÖظ´£© ÔòÊä³ö 1£¬4£»2£¬3¡£ Íû¸ßÊִͽ̣¡£¡ µÚÒ»Ìâ,×¢Òâ¿ÉÔö³¤Êý×éµÄÓ¦ÓÃ. #include #include int main(void) { int MAX = 10; int *a = (int *)malloc(MAX * sizeof(int)); int *b; FILE *fp1; FILE *fp2; fp1 = fopen("a.txt","r"); if(fp1 == NULL) {printf("error1"); exit(-1); } fp2 = fopen("b.txt","w"); if(fp2 == NULL) {printf("error2"); exit(-1); } int i = 0; int j = 0; while(fscanf(fp1,"%d",&a[i]) != EOF) { i++; j++; if(i >= MAX) { MAX = 2 * MAX; b = (int*)realloc(a,MAX * sizeof(int)); if(b == NULL) { printf(¡°error3¡å); exit(-1); } a = b; } } for(;¨Cj >= 0;) fprintf(fp2,¡±%d\n¡±,a[j]); fclose(fp1); fclose(fp2); return 0; } µÚ¶þÌâ. #include int main(void) { unsigned long int i,j,k; printf(¡°please input the number\n¡±); scanf(¡°%d¡±,&i); if( i % 2 == 0) j = i / 2; else j = i / 2 + 1; printf(¡°The result is \n¡±); for(k = 0; k < j; k++) printf(¡°%d = %d + %d\n¡±,i,k,i ¨C k); return 0; } #include void main() { unsigned long int a,i=1; scanf(¡°%d¡±,&a); if(a%2==0) { for(i=1;iprintf(¡°%d¡±,a,a-i); } else for(i=1;i<=a/2;i++) printf(¡± %d, %d¡±,i,a-i); } ÐÖµÜ,ÕâÑùµÄÌâÄ¿ÈôÊÇ×ö²»³öÀ´ÊµÔÚÊÇÓÐЩ²»Ó¦¸Ã, ¸øÄãÒ»¸öµÝ¹æ·´ÏòÊä³ö×Ö·û´®µÄÀý ×Ó,¿ÉνÊÇ·´ÐòµÄ¾µäÀý³Ì. void inverse(char *p) { if( *p = = ¡®\0¡® ) return; inverse( p+1 ); printf( ¡°%c¡±, *p ); } int main(int argc, char *argv[]) { inverse(¡°abc\0¡å); return 0; } ½èÇ©ÁËÂ¥Éϵġ°µÝ¹æ·´ÏòÊä³ö¡± #include void test(FILE *fread, FILE *fwrite) { char buf[1024] = {0}; if (!fgets(buf, sizeof(buf), fread)) return; test( fread, fwrite ); fputs(buf, fwrite); } int main(int argc, char *argv[]) { FILE *fr = NULL; FILE *fw = NULL; fr = fopen(¡°data¡±, ¡°rb¡±); fw = fopen(¡°dataout¡±, ¡°wb¡±); test(fr, fw); fclose(fr); fclose(fw); return 0; }
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