You are here:   HomeC Programming (Theory)Control Structures in CWrite a C program which to find the grace marks for a student using switch. The user should enter the class obtained by the student and the number of subjects he has failed in.

# Write a C program to given three points (x1, y1), (x2, y2) and (x3, y3), write a program to check if all the three points fall on one straight line.

by Dinesh Thakur Category: Control Structures

```#include<stdio.h>

#include<conio.h>

#include<math.h>

void main()

{

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

int s1,s2,s3;

clrscr();

printf("\nEnter the values of x1 and y1 coordinates of first point:");

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

printf("\nEnter the values of x2 and y2 coordinates of first point:");

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

printf("\nEnter the values of x3 and y3 coordinates of first point:");

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

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

s2 = abs(x3- xl)/abs (y3 – y1);

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

printf("\n\tPoints are Collier.");

else

printf("\n\tPoints are Not Collier"):

printf("\n press any key to exit.");

getch();

}

OUTPUT:

Enter the values of x 1 and y 1 coordinates of first point: 10 12

Enter the values of x2 and y2 coordinates of first point: 15 17

Enter the values of x3 and y3 coordinates of first point: 20 22

Points are Collier.

press any key to exit.

```

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Dinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular Computer Notes blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to contact us.

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