First, the object pointer
#include<iostream>
#include"circle.h"
int main()
{
auto* c1 = new Circle{
1.0 };
Circle c3{
2.0 };
auto c2 = &c3;
std::cout << (*c1).getArea() << std::endl;
std::cout << c2->getArea() << std::endl;
auto c5 = new Circle[3]{
1.0,2.0,3.0 };
for (int i = 0; i < 3; i++)
{
std::cout << c5[i].getArea() << std::endl;
}
delete c1;
delete[]c5;
c1 = c5 = nullptr;
delete c1;
return 0;
}
2. Auxiliary documents
Circle class C file
#include"circle.h"
Circle::Circle()
{
radius = 1.0;
}
Circle::Circle(double radius_)
{
radius = radius_;
}
double Circle::getArea()
{
return (3.14 * radius * radius);
}
Circle class H file
#pragma once
class Circle
{
private:
double radius;
public:
Circle();
Circle(double radius_);
double getArea();
};