Please explain what this code means. How would the results differet from expecta

ID: 3737020 • Letter: P

Question

Please explain what this code means. How would the results differet from expectations?

#include <iostream>

#include <cmath>

using namespace std;

#ifndef M_PI

#define M_PI (4.0 * std::atan2(1.0, 1.0))

#endif

int main() {

int ngon = 3;

double insngon = 0.0 ;

double cirngon = 0.0;

cout << "N" << " " << "ins-ngon" << " " << "cirngon" << " " << " ";

while(ngon <= 30)

{

insngon = 2*ngon*sin(M_PI/ngon);

cirngon = 2*ngon*tan(M_PI/ngon) ;

printf("%d %.14lf %.14lf ",ngon,insngon,cirngon);

ngon++;

if(cirngon-insngon <= pow(10.0,-15)) break;

}

Here the M_PI is fixed with a particular value

The table goes for the polygon sides less than equal to 30.And here the loop continues until (cirngon-insngon <= pow(10.0,-15) ) is not satisfied .

THe actual result may differ in case if the radian value is considered for the calculation.