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

Header file: Standard

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)

{

float area, circumference, radius;

 

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

cin>>radius;

// circle area = PI*radius*radius

area = PI * radius * radius;

 

// circumference = 2*PI*radius

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

Press any key to continue . . .

 

 

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