Calculate area of circle in C++ programming || Area of circle program in c++

 C++ Program to Find Area of a Circle:

To calculate area of  circle in C++ programming, you have to ask from user to enter the radius of circle, place the radius in a variable say radius and then initialize 3.14*radius*radius in a variable that holds the value of area of circle.

C++ program:

Source Code:

// C++ Program to Find Area of a Circle

#include<iostream>

/*  iostream provides basic

input and output services for C++ programs */ 

using namespace std;

int main()

// Th execution of program start with the main function  

{

    float radius, area;

//Variable Declarations specify the type followed by the name    

    cout<<"Enter the Radius of Circle: ";

// cout is used to display the same statement in the output.     

    cin>>radius;

// cin is used to enter the value by the user. 

// formula    

    area = 3.14*radius*radius;

    cout<<"\nArea of Circle = "<<area;

    cout<<endl;

// endl is used to enter the new line character    

    return 0;

}