C++ Program to Check Whether a Given Points are Colinear or Not

This is a C++ Program to check whether points are colinear or not.

Here is source code of the C++ Program to Check Whether a Given Points are Colinear or Not. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
#include <iostream>
```
```
#include <time.h>
```
```
#include <stdlib.h>
```
```
 
```
```
using namespace std;
```
```
 
```
```
const int LOW = 1;
```
```
const int HIGH = 10;
```
```
 
```
```
int main(int argc, char **argv)
```
```
{
```
```
    int x, y, x1, x2, y1, y2;
```
```
    time_t seconds;
```
```
    time(&seconds);
```
```
    srand((unsigned int) seconds);
```

    x = rand() % (HIGH - LOW + 1) + LOW;

    y = rand() % (HIGH - LOW + 1) + LOW;

    x1 = rand() % (HIGH - LOW + 1) + LOW;

    x2 = rand() % (HIGH - LOW + 1) + LOW;

    y1 = rand() % (HIGH - LOW + 1) + LOW;

    y2 = rand() % (HIGH - LOW + 1) + LOW;

```
 
```

    cout << "The points are: (" << x << ", " << y << "), (" << x1 << ", " << y1

            << "), & (" << x2 << ", " << y2 << ")\n";

    cout << "The Equation of the line is : (" << (y2 - y1) << ")x+(" << (x1

            - x2) << ")y+(" << (x2 * y1 - x1 * y2) << ") = 0\n";

```
 
```

    int s = (y2 - y1) * x + (x1 - x2) * y + (x2 * y1 - x1 * y2);

```
    if (s < 0)
```

        cout << "The points are NOT colinear";

```
    else if (s > 0)
```

        cout << "The points are NOT colinear";

```
    else
```

        cout << "The points are colinear";

```
}
```

Output:

$ g++ ColinearPoints.cpp
$ a.out
 
The points are: (9, 5), (4, 6), & (1, 2)
The Equation of the line is : (-4)x+(3)y+(-2) = 0
The points are NOT colinear
------------------
(program exited with code: 0)
Press return to continue

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