C++ - Find if 3 points or coordinates are collinear

C++ - Find if 3 points or coordinates are collinear

CODE

//This program takes 3 coordinates as inputs, //...calculates the area of the triangle formed by the 3 points //...and determine if these 3 points are collinear //The 3 points are collinear, if the area is 0 #include <iostream> using namespace std; int main() { //Declare the required variables to store the 3 coordinates int x1, y1, x2, y2, x3, y3; //Get the x, y coordinates of the 1st one. //Store it in the variables x1, y1 cout << "Enter x, y separated by spaces of the coordinate 1: "; cin >> x1 >> y1; //Get the x, y coordinates of the 2nd one. //Store it in the variables x2, y2 cout << "Enter x, y separated by spaces of the coordinate 2: "; cin >> x2 >> y2; //Get the x, y coordinates of the 3rd one. //Store it in the variables x3, y3 cout << "Enter x, y separated by spaces of the coordinate 3: "; cin >> x3 >> y3; //The area of the triangle can be found using the formula below //Calculate the area and store it in the variable "area" float area = 0.5 * ( x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2) ); //Check if the calculated area is 0 and display the message acccordingly if(area == 0) cout << "The 3 points are collinear."; else cout << "The 3 points are not collinear."; return 0; //Input: 2 4, 4 6, 6 8 //Output: The 3 points are collinear. }