displays the position or index in the string S where the string T begins, or - 1 if S doesn't contain T.

/* Write a C program that displays the position or index in the string S
where the string T begins, or - 1 if S doesn't contain T.
*/

#include
#include
#include

void main()
{
char s[30], t[20];
char *found;
clrscr();

/* Entering the main string */
puts("Enter the first string: ");
gets(s);

/* Entering the string whose position or index to be displayed */
puts("Enter the string to be searched: ");
gets(t);

/*Searching string t in string s */
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();
}