Check if a point is inside, outside or on the parabola in C++

Suppose, one parabola is given (the vertex coordinate (h, k) and distance from focus and vertex is a), another point is also given. We have to find whether the point is inside the parabola or not. To solve it, we have to solve the following equation for the given point (x, y)

\left(y-k\right)^2=4a\left(x-h\right)

If the result is less than 0, then this is present inside the parabola if it is 0, then it is on the parabola, and if greater than 0, then outside of the parabola.

Example

 Live Demo

#include <iostream>
#include <cmath>
using namespace std;
int isInsideParabola(int h, int k, int x, int y, int a) {
   int res = pow((y - k), 2) - 4 * a * (x - h);
   return res;
}
int main() {
   int x = 2, y = 1, h = 0, k = 0, a = 4;
   if(isInsideParabola(h, k, x, y, a) > 0){
      cout <<"Outside Parabola";
   }
   else if(isInsideParabola(h, k, x, y, a) == 0){
      cout <<"On the Parabola";
   } else{
      cout <<"Inside Parabola";
   }
}

Output

Inside Parabola

Arnab Chakraborty

Published on 22-Oct-2019 06:43:41

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