#2 | C++ | Write a Program to Calculate Area of a circle.

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CompTech


 C++ Practical Assignment

#practical 2 








YouTube Video :- 


Question :- 

Write a Program to calculate area of a Circle in C++.

Code :-

// Write a Program to Find Area of a circle
// Area = pi(3.14) * r * r
// r = Radius of a circle

#include<iostream>

using namespace std;

int main()
{
    // declare some variables
    int r;
    float pi=3.14, area;

    // assign values from user

    cout<<"Enter radius of a Circle :- ";
    cin>>r;

    // calculate the area of circle

    area = (float) pi * r * r;

    // print area of a circle

    cout<<"\n-> Area of a Circle = "<<area;
}

Description :-

- First we have to declare three variables to store the data..
1. integer r for storing the value of radius
2. float pi for pi(3.17)
3. float area to store the result after calculation

- After declaring variables we have to assign the value to the Integer variable 'r'         from user.

- Then we have to calculate the area by using the formula.
- formula = pi * r *r

- After calculation, we have the area of circle in our float variable area.

- we simply print the variable float for displaying the result.

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