C program to check if points are collinear

Q:Given three points,write a program to check whether the given points fall in a straight line

#include

#include

void main()

{

int x1,x2,y1,y2,x3,y3;

int s1,s2,s3;

clrscr();

printf("enter value of x1,y1:");

scanf("%d%d",&x1,&y1);

printf("enter value of x2,y2:");

scanf("%d%d",&x2,&y2);

printf("enter value of x3,y3:");

scanf("%d%d",&x3,&y3);

s1=abs(x2-x1)/abs(y2-y1);

s2=abs(x3-x1)/abs(y3-y1);

s3=abs(x3-x2)/abs(y3-y2);

if(s1==s2&&s1==s3)

{

printf("points are collinear");

}

else

{

printf("points are not collonear");

}

getch();

}