Write a program that checks whether a given substring is present in the given string.

Example
Enter the string : my name is toto
Input the substring : to
The substring exists in the string at position 12.

#include <stdio.h>
#define SIZE 100
void main()
{
	char str[SIZE], substr[SIZE];	
	int i,j,flag;

        printf("Enter the string : ");
        gets(str);

	printf("Input the substring : ");
	gets(substr);

	for(i=0; str[i]!='\0'; i++)
	{ 
		flag=1;
		for(j=0; substr[j]!='\0';j++)
		{
			if (str[i+j]!=substr[j])
			{
				flag=0;
			   	break;
			}
		}
		if (flag==1)
			break;
	}
	if (flag==1)
		printf("The substring exists in the string at position %d.\n", i+1);
	else
		printf("The substring does not exists in the string.\n");
}