Calculate the circumference and area of a circle for the given radius C++ program example

Compiler: Visual C++ Express Edition 2005

Compiled on Platform: Windows XP Pro SP2

Additional project setting: Set project to be compiled as C++

Project -> your_project_name Properties -> Configuration Properties -> C/C++ -> Advanced -> Compiled As: Compiled as C++ Code (/TP)

Other info:

To do: Calculate the circumference and area of circle for the given radius in C++ programming

To show: How to calculate the circle areas and circumference if radius is given, C++ operators, operands, variables and data types

// to calculate the circumference and area of circle

#include <iostream>

using namespace std;

// define identifier PI with a constant

#define PI 3.14159

// define identifier TWO with a constant

#define TWO 2.0

int main(void)

{

cout<<"\nEnter a radius of the circle in meter: ";

circumference = TWO * PI * radius;

// circle circumference

cout<<"\nCircumference = "<<circumference<<" meter";

// circle area

cout<<"\nCircle area = "<<area<<" square meter"<<endl;

return 0;

}

Output example:

Enter a radius of the circle in meter: 4.50

Circumference = 28.2743 meter

Circle area = 63.6172 square meter

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