CPlusPlusClasses/geometry/circle.cpp

#include "circle.h"
#define _USE_MATH_DEFINES// for C++
#include <math.h>

double circle::calc_area()
{
	return M_PI*radius*radius;
}

double circle::calc_perimeter()
{
	return 2*radius*M_PI;
}

void circle::name()
{
	cout << "circle\n";
}