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

// Error checking
int main()
{
	FILE *in;
	int i;
	
	in = fopen("dat.txt", "r"); // dat.txt instead of data.txt
	
	if(in == NULL) // fopen returns a NULL pointer if it fails to open the file for any reason
		printf("File not found!\n");
	else
	{
		fscanf(in, "%d", &i);  // read a single integer from the file
		printf("i=%d\n", i);   // print it on the screen
		fclose(in);
	}
	
	system("pause");
}