Area of Circle program in c++. Circumference of circle in Cpp. Area and perimeter of circle program.

Formulae:                               

• Area of Circle = π r²

• Circumference of Circle =2 π r 

Calculate and print area and circumference of circle

Code

#include<bits/stdc++.h>

using namespace std;

void Area(int r){

    float area=3.14*r*r;                   //formula to calculate area of circle

    cout<<"Area of Circle is: "<<area<<endl;                                //prints area of circle

}

void Circumference(int r){

float circumference=2*3.14*r;         //formula to calculate circumference of circle

cout<<"Perimeter of Circle is: "<<circumference<<endl; //prints circumference of circle

}

int main(){

    cout<<"Enter Radius of the Circle "<<endl;                 //Requesting Radius

    int radius;                                                                      //to store radius

    cin>>radius;                                                                 //reading radius

    Area(radius);                                                               //calling Area function

    Circumference(radius);                   //calling Circumference function

return 0;

}

Output

Enter Radius of the Circle 

4

Area of Circle is: 50.24

Perimeter of Circle is: 25.12