C++ Program to Find Area of Circle

Question : Write a C++ program to find Area of Circle?

Explain: C++ Question about finding Area of Circle with input from user then program calculate Area of Circle. 

Formula:  Area of Circle =pie*Radius*Radius

Solution:

 /************************************************************ 
                               C++ Program for Area of Circle
 *************************************************************
***************** By cpplanguage.com *********************/

#include<iostream>
using namespace std;

int main()
{
// constant pie value
constant float pie=3.14
float radius,area;
cout<< "Enter radius of circle : ";
// getting radius input 
cin>>radius;
//formula area=pie*radius*radius
area = 3.14*radius*radius;
cout<<"Area of circle is : "<<area<<endl;
return 0;
}

Output: