C Program to find distance between two straight lines

Program

#include<stdio.h>
#include<math.h>
void main()
{
	int x1, x2, y1, y2;
	int s1, s2, distance;
	printf("Enter two values for line 1:\n");
	scanf("%d %d", &x1, &x2);
	printf("Enter two values for line 2:\n");
	scanf("%d %d", &y1, &y2);
	s1 = x2 - x1;
	s2 = y2 - y1;
	distance = sqrt(pow(s1,2) + pow(s2,2));
	printf("Distance between two lines is:\t%d\n", distance);
}

Output

Enter two values for line 1:
78
65
Enter two values for line 2:
54
39
Distance between two lines is:	19