【csdn題集】刪除字符串中指定字符

問題：

編寫一函數delchar（s，c）該函數將字符串s中出現的所有c字符刪除，不管有無都要做出相應說明，例如刪除了幾個c字符。

 

解答：

 

#include <stdlib.h> #include <stdio.h> #include <string.h> int del_char(char* src, char c) { if ( NULL == src) { fprintf(stderr, "del_char failed: invalid input./n"); return -1; } char* pchTemp = (char*)malloc(strlen(src) + 1); if ( NULL == pchTemp) { fprintf(stderr, "del_char failed: malloc failed/n"); return -1; } int num = 0; int i = 0; int j = 0; while ( src[i] != '/0') { if ( src[i] != c) { pchTemp[j++] = src[i++]; } else { i++; num++; } } pchTemp[j] = '/0'; if ( 0 != num) { strncpy(src, pchTemp, strlen(pchTemp) + 1); } free(pchTemp); return num; } int main(int argc, char* argv[]) { if ( 3 != argc) { fprintf(stderr, "Usage: %s [src] [c]/n", argv[0]); return -1; } char szSrc[512] = {0}; snprintf(szSrc, sizeof(szSrc), "%s", argv[1]); char c = argv[2][0]; int num = 0; if ( (num = del_char(szSrc, c)) < 0) { return -1; } else { printf("num: %d after del %c: %s/n", num, c, szSrc); return 0; } return 0; } 

 

編譯與結果：

user_00@ubuntu:~/study/csdn$ gcc del_char.c 

user_00@ubuntu:~/study/csdn$ ./a.out afdgdgdgdg d

d

num: 4 after del d: afgggg