Use of strstr function in C program.

strstr in C

strstr is a function in C that is used to find the first occurrence of a substring in a string. It is declared in the <string.h> header.

Syntax:

char *strstr(const char *str1, const char *str2);

• str1 → The main string in which you want to search.
• str2 → The substring you are searching for.

Returns:

• A pointer to the first occurrence of str2 in str1.
• NULL if str2 is not found.

Example:

//String Processing using strstr function.

#include<stdio.h>

#include<string.h>

int main()

{

    char str1[10]="12345", str2[10]="23";

    int n;

    n=strstr(str1,str2);

 

    puts(n);

    return 0;

}

Output:

2345