Check straight line condition

/* A program to check whether given three points fall on one straight line or not */


#include<stdio.h>


int main()

{
    int x1, x2, x3, y1, y2, y3 ;

printf("\nEnter the Co-ordinates of first point(x1,y1)");
scanf("%d%d",&x1, &y1);

printf("\nEnter the Co-ordinates of 2nd point(x2,y2)");
scanf("%d%d",&x2, &y2);

printf("\nEnter the Co-ordinates of 3rd point(x3,y3)");
scanf("%d%d",&x3, &y3);

if( (y2-y1)/(x2-x1)==(y3-y2)/(x3-x2) )
printf("The three points lie on straight line");

else
printf("The three points do not lie on straight line");

return 0;

}