C++ Program to calculate the area of a circle

October 14, 2022

Finding the Area of  circle in C++ :-

Here we will discuss how to find the area of a circle when its radius is given using c++ programming language.

The area of a circle can be found by using the formula:
Area of circle= 𝝅R*R

Area of circle in C++
While loop in C

Working:-

  • User gives an input
  • The input is stored in a float type variable say rad.
  • Another float type variable is taken say circleArea.
  • Now using the formula we find the area of the circle of radius rad and store it in circleArea.

                          circleArea= 3.14* rad* rad;

  • Print the value of circleArea.

Code in C++

Run 
#include<bits/stdc++.h>
using namespace std;

int main(){
    float rad = 3, area;
    
    area=(3.14*rad*rad);
    cout<<"Area of circle is "<<area;
}

Output

Area of circle is 28.26

Algorithm using diameter :-

  • User gives an input (diameter of the circle)
  • The input is stored in a float type variable say d.
  • Another float type variable is taken say circleArea.
  • Now using the formula we find the area of the circle of diameter d and store it in circleArea.

                          circleArea= (3.14* d* d)/4;

  • Print the value of circleArea.

Code in C++

Run 
#include<bits/stdc++.h>
using namespace std;

int main(){
    float d = 6, area;
    
    area=(3.14*d*d)/4;
    cout<<"Area of circle is "<<area;
}

Output

Area of circle is 28.26

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While loop in C