strstr函数的用法_c find函数返回值_strchr函数(4)

The terminating '\0' characters are not compared.

The strcasestr() function is like strstr(), but ignores the case of both arguments.

* RETURN VALUE

These functions return a pointer to the beginning of the substring, or NULL if the substring is not found.

*/

    char *pRetval = strstr( (char *)pSrc, pDst);
    printf("[%s]-[%d] pRetval = %s \n", __func__, __LINE__, pRetval);

/* 个人理解： 在源字符串中需找目标字符串，如果源字符串中存在，

则返回出现目标字符串的首地址，不存在，则返回空

对大小写字母敏感(区分大小写)*/

    pRetval = strcasestr( (char *)pSrc, pDst );
    printf("[%s]-[%d] pRetval = %s \n", __func__, __LINE__, pRetval);

/* 个人理解： 在源字符串中需找目标字符串，如果源字符串中存在，

则返回出现目标字符串的首地址，不存在，则返回空

对大小写字母不敏感(忽略大小写)*/

   
    return 0;
}

3 strchr strrchr,

在字符串中查找对应ASCII码为对应正数的字节，前面函数返回第一次查找到，后面函数返回最后一次查找到

int main (void )
{

/* NAME

strchr, strrchr, -locate character in string

SYNOPSIS

#include <string.h>

char *strchr(const char *s, int c);

char *strrchr(const char *s, int c);

DESCRIPTION

The strchr() function returns a pointer to the first occurrence of the character c in the string s.

The strrchr() function returns a pointer to the last occurrence of the character c in the string s.

RETURN VALUE

The strchr() and strrchr() functions return a pointer to the matched character or NULL if the character is not found.

*/

    const char *pSrc = "xxxxbooooobwbppppppbcccccccc";
    
    char *pRetval = strchr((char*)pSrc, 98);
    printf("[%s]-[%d] pRetval = %s \n", __func__, __LINE__, pRetval);

/* 个人理解：在目标字符串中，从字符串开头开始查找对已ASCII码为98的字节，

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