删除指定字符串的相应字符 

假设字符串 "cabcdefcgchci" ，那么要求你写一个函数，把该字符串中所有的字符 ’c’ 删除掉。那么结果应该是 "abdefghi"。 

00和01是用for循环来实现的算法

char * DeleteChararcter_00(char *str,int c)

{

    char *p,*ret;

    for(ret= p = str;*p;p++)

    {

       if(*p == c)

           continue;

       *str++ = *p;

    }

    *str = '/0';

    return ret;

}

char * DeleteChararcter_01(char *str,int c)

{

    char *p,*ret;

    for(ret= p = str;*p;p++)

    {

       if(*p != c)

           *str++ = *p;

    }

    *str = '/0';

    return ret;

}

02和03是用while循环来实现的算法

char * DeleteChararcter_02(char *str,int c)

{

    char *p,*ret;

    ret = p = str;

    while(*p)

    {

       if(*p++ == c)

           continue;

       *str++ = *(p-1);

    }

    *str = '/0';

    return ret;

}

char * DeleteChararcter_03(char *str,int c)

{

    char *p,*ret;

    ret = p = str;

    while(*p)

    {

       if(*p != c)

           *str++ = *p;

       p++;

    }

    *str = '/0';

    return ret;

}