Question

How to calculate area, diameter and circumference of circle in C++

Answer 1

#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
	int radius = 3;
	float PI = 3.14f;

	float area = PI * radius * radius;
	cout << "Area = " << fixed << setprecision(2) << area << endl;

	float diameter = 2 * radius;
	cout << "Diameter = " << fixed << setprecision(2) << diameter << endl;

	float circumference = 2 * PI * radius;
	cout << "Circumference = " << fixed << setprecision(2) << circumference << endl;

	return 0;
}

/*
run:

Area = 28.26
Diameter = 6.00
Circumference = 18.84

*/

 

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