字符串的查找删除 （C语言代码）

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

char *remove_sub(char *s, char *sub){

int len_s, len_sub, i, j;

char *ns;

len_s = strlen(s);

len_sub = strlen(sub);

for(i = 0; i <= len_s - len_sub;){

for(j = 0 ; j < len_sub; ++j){

if(s[i + j] == sub[j] || s[i + j] >= 'a' && s[i + j] <= 'z' && sub[j] >= 'A' && sub[j] <= 'Z' && s[i + j] - 'a' == sub[j] - 'A'

|| s[i + j] >= 'A' && s[i + j] <= 'Z' && sub[j] >= 'a' && sub[j] <= 'z' && s[i + j] - 'A' == sub[j] - 'a') continue;

else break;

}

if(j == len_sub){

for(j = 0 ; j < len_sub; ++j) s[i + j] = ' ';

i += j;

}else ++i;

}

ns = (char*)calloc(len_s + 1, sizeof(char));

for(i = j = 0; s[i] != '\0'; ++i){

if(s[i] != ' ') ns[j++] = s[i];

}

ns[j] = '\0';

return ns;

}

int main(){

char sub[30], s[1000], *ns;

scanf("%s", sub);

getchar();

while(gets(s)){

ns = remove_sub(s, sub);

puts(ns);

free(ns);

}

return 0;

}