/**
 * file: main.c
 * author: 简单教程(www.twle.cn)
 *
 * Copyright © 2015-2065 www.twle.cn. All rights reserved.
 */

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

// 删除字符串中指定字母函数
char* deleteCharacters(char * str, char * charSet)
{
    int hash [256];
    if(NULL == charSet)
        return str;
    for(int i = 0; i < 256; i++)
        hash[i] = 0;
    for(int i = 0; i < strlen(charSet); i++)
        hash[charSet[i]] = 1;
    int currentIndex = 0;
    for(int i = 0; i < strlen(str); i++)
    {
        if(!hash[str[i]])
            str[currentIndex++] = str[i];
    }
    str[currentIndex] = '\0';
    return str;
}

int main()
{
    char s[2] = "a";     // 要删除的字母
    char s2[5] = "aca";  // 目标字符串
    printf("%s\n", deleteCharacters(s2, s));
    return 0;
}

c