Write a program to calculate the area of the circle, taking the value of the radius from the user.

Code:

#include<iostream>

#include<conio.h>

#include<math.h>

using namespace std;

void main()

{

       float rad,area;

       cout<<“Enter the value of Radius: \n\n”;

       cin>>rad;

       area= 2*3.142*rad;

       cout<<“\nArea of the circle is: “<<area;

       getch();

}

#include<iostream>
#include<conio.h>
#include<math.h>
using namespace std;
void main()
{
	float rad,area;
	cout<<"Enter the value of Radius: \n\n";
	cin>>rad;
	area= 2*3.142*rad;
	cout<<"\nArea of the circle is: "<<area;
	getch();
}

 

Output:

C++ projects for beginners with source code