C++查找字符在字符串中出现的次数

 int count1(char* str,char* s)
{
    char* s1;
    char* s2;
    int count = 0;
    while(*str!='\0')
    {
        s1 = str;
        s2 = s;
        while(*s2 == *s1&&(*s2!='\0')&&(*s1!='0'))
        {
            s2++;
            s1++;
        }
        if(*s2 == '\0')
            count++;
        str++;
    }
    return count;
}