c语言 字符串包含函数
    English Answer:
    The strstr() Function.
    The `strstr()` function in C language is used to find the first occurrence of a substring within a string. It takes two arguments:
    1. A pointer to the string to be searched (haystack).
    2. A pointer to the substring to be found (needle).
    If the substring is found within the string, the function returns a pointer to the first character of the substring within the string. If the substring is not found, the function returns a null pointer (`NULL`).
    Syntax:
    char strstr(const char haystack, const char needle);
    Return Value:
    A pointer to the first occurrence of the substring within the string, or `NULL` if the substring is not found.
    Example:
    C.
    #include <stdio.h>。
    #include <string.h>。
    int main()。
    {。
        char haystack[] = "Hello, world!";
        char needle[] = "world";
字符串函数定义        char result = strstr(haystack, needle);
        if (result != NULL)。
        {。
            printf("Substring found at position %d\n", result haystack);
        }。
        else.
        {。
            printf("Substring not found\n");
        }。
        return 0;
    }。
    Output:
    Substring found at position 7。
    The strchr() Function.
    The `strchr()` function in C language is used to find the first occurrence of a character within a string. It takes two arguments:
    1. A pointer to the string to be searched (haystack).
    2. The character to be found (needle).
    If the character is found within the string, the function returns a pointer to the first occurrence of the character within the string. If the character is not found, the function returns a null pointer (`NULL`).

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