单个字符查找函数strchr()

单个字符查找函数strchr()

//查找字符串得到0开头的索引 ，-1代表没有找到
#include <stdio.h>
int StringChar(const char* str, int c)
{//返回0开头的索引

    int i = -1;
    while (str[++i])
    {
        if (str[i] == c)
            return i;
    }
	return -1;
}
int main()
{
    char str[] = "This is a sample string";

    printf("Looking for the 's' character in \"%s\"...\n", str);
    int n  = StringChar(str, 's');
    int sum = 0;
    while (n!=-1)
    { 
        sum += n+1;
        printf("found at %d\n", sum);
       
        n = StringChar(&str[sum], 's');
    }
    return 0;
}