C语言寻找字符在字符串中的位置

利用char *strchr(const char *str, int c) 函数返回的指针，判断字符c所在的位置

找到第一个位置之后，从该位置的下一个字符起找。

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


int main()
{
    char str[] = "this is a sample string";
    char *pch;
    printf("looking for "s" character in "%s"
 ",str); 
    pch = strchr(str,"s");
    printf("str address = %p
",str);
    printf("pch address = %p
",pch);
    while(pch != NULL ){
        printf("found at %d
",pch-str);
        pch = strchr(pch+1,"s");
    }
    return 0;
} 

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