C program that displays the position or index in the string

Write a C program that displays the position or index in the string S where the string T begins,or-if S doesn't contain T .

program:

#include<stdio.h>

#include<string.h>

#include<conio.h>

void main()

{

 char s[30], t[20];

 char *found;

 clrscr();

 puts("Enter the first string: ");

 gets(s);

 puts("Enter the string to be searched: ");

 gets(t);

 found = strstr(s, t);

 if(found)

 {

 printf("Second String is found in the First String at %d position.\n", found - s);

 }

 else

 {

 printf("-1");

 }

 getch();

}

output: