C++ Program to Find Out the Area of Circle

In this tutorial, we will learn about the area of circle i.e. how to find out the area of circle using C++

So, here’s some quick information related to the program which can help you to know better, i.e. What actually it says?

Quick Info:💡

↪ Circle is a round-shaped figure with no edges or corners i.e. circle contains parameters such as radius, and diameter.

↪ We provide you with the radius of the circle and your task is to display the result as the area of the square on the output console.

↪ Steps to perform the above task:

• First, Input the radius of a circle.
• Second, Use the formula to find out the area i.e. Area = 3.14*radius*radius
• Third, Display the result on the output screen.

↪ It can be done using different ways:

• Using a direct method
• Using function

Find Out Area of Circle Using Direct Method

Here’s a direct method to print the output on the output screen.

Simply, the user will be asked to enter the input and the area of a circle is computed and displayed to the user.

Example:

#include<iostream.h>
#include<conio.h>
void main()
{
double radius, area;
cout<<"Enter the radius of circle: ";
cin>>radius;
area=3.14*radius*radius;
cout<<"Area of circle is: ";
cout<<area;
getch();
}

//Output:
Enter the radius of circle: 5
Area of circle is: 78.5

Working:

Flow of a program:

Find Out Area of Circle Using Function

Functions are used to perform certain actions, and they are important for reusing code: Define the code once and use it many times.

And, this is a another method to find out the area of circle at different sides i.e. by function.

Note: Always remember that execution starts from the main body only.

Example:

#include<iostream.h>
#include<conio.h>
double area_of_circle(int r)
{
double area=3.14*r*r;
cout<<"Area of a circle for radius "<<r<<"is: ";
return area;
void main()
{
cout<<area_of_circle(14)<<endl;
cout<<area_of_circle(5);
getch();
}

//Output:
Area of circle for radius 14 is: 615.44
Area of circle for radius 5 is:  78.5

Working:

Flow of a program:

Well, I hope it really helped you to know C++ better.

Attention reader⚠ Don’t stop learning now.

Want to do more related programs? Just visit Area of Square.

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