Check if the string contains a character

/*
Example: Testing if a string is found or not in C language
*/

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

int main()
{
    char str[] = "Hello world!";

    if(strchr(str, '!') != NULL)
    {
        printf( "! is found in string");
    }

    return 0;
}