program for three points on straight line||luv yadav||

/*given three points (x1,y1), (x2,y2)and (x3,y3), write a program

 to chek if all the three points fall on one straight line*/

#include<stdio.h>

#include<conio.h>

int main()

{

clrscr();

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

printf("x1:");

scanf("%d",&x1);

printf("x2:");

scanf("%d",&x2);

printf("x3:");

scanf("%d",&x3);

printf("y1:");

scanf("%d",&y1);

printf("y2:");

scanf("%d",&y2);

printf("y3:");

scanf("%d",&y3);

t=(x1*(y2-y3)+x2*(y3-y1)+x3*(y1-y2));

if(t==0)

{

printf("this points present om straight line:");

}

else

{

printf("this point does not lie on straight line:");

}

getch();

return(0);

}

by luv yadav