Determine position of two points with respect to a 3D plane

#include <iostream>

using namespace std;

void check_position(int a, int b, int c, int d,

int x1, int y1, int z1,

int x2, int y2, int z2)

{

int value_1 = a * x1 + b * y1 + c * z1 + d;

int value_2 = a * x2 + b * y2 + c * z2 + d;

if ((value_1 > 0 && value_2 > 0)

|| (value_1 < 0 && value_2 < 0))

cout << "On same side";

if ((value_1 > 0 && value_2 < 0)

|| (value_1 < 0 && value_2 > 0))

cout << "On different sides";

if (value_1 == 0 && value_2 == 0)

cout << "Both on the plane";

if (value_1 == 0 && value_2 != 0)

cout << "Point 1 on the plane";

if (value_1 != 0 && value_2 == 0)

cout << "Point 2 on the plane";

}

int main()

{

int a = 1, b = 2, c = 3, d = 4;

int x1 = -2, y1 = -2, z1 = 1;

int x2 = -4, y2 = 11, z2 = -1;

check_position(a, b, c, d,

x1, y1, z1,

x2, y2, z2);

return 0;

}

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