Write a program to calculate area of circle.
Source Code
#include<iostream>
using namespace std;
int main()
{
float r,area;
cout<< "\nEnter radius of circle : ";
cin>>r;
area = 3.14*r*r;
cout<<"Area of circle : "<<area;
return 0;
}
Output
Enter radius of circle : 7
Area of circle : 153.86