Given three points x1y1x2y2 x3y3 write a program to check if all three points fall on one straight line using only conditional statementsififelse nested if only?

Answer 1

#include<stdio.h>

#include<conio.h>

void main()

{

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

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

scanf("d",&1x, &y1);

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

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

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

scanf("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");

getch();

}