This is program take radius of circle from user and calculate area of circle. Program to calculate area of circle.Program to calculate area of circle in C++ and you can compile and run it on Dev C++ and Code Block.The Source Code is given below.

#include<iostream> /*theteknek.com*/

using namespace std;

float PI=3.1415;

int main()

{

float a,r;

cout<<“Enter the Radius of Circle “;

cin>>r;

a=PI*r*r;

cout<<“Area of Circle is=”<<a;

return(0);

}

Output is given below.

This is program take radius of circle from user and calculate area of circle. Program to calculate area of circle.Program to calculate area of circle in C++ and you can compile and run it on Dev C++ and Code Block.The Source Code is given below.#include<iostream>using namespace std;float PI=3.1415;int main(){float a,r;cout<<“Enter the Radius of Circle “;cin>>r;

a=PI*r*r;cout<<“Area of Circle is=”<<a;return(0);}.Write a *program to calculate area of circle*. Source *Code*; Output. #include<iostream> using namespace std; int main() { float r,*area*; cout<< “\n Enter radius of. To *calculate area* and circumference of any *circle* in C++ Programming, you have to ask to the user to enter the radius of *circle*, place the radius in a variable say r and make two variable, one for *area* and other for circumference, and place 3.14*r*r in *area* and 2*3.14*r in circumference, then display the result on the. *c++ program to find area of circle find area of circle* in c++. *Program*:- Output 1:- Enter radius of *circle*: 10.5. *Area of circle* is: 346.360. Output 2:- Enter radius of . In *C++* programming you can easily write any *program*, for print message on screen use cout<<” ” and for receive input use cin>>. For *calculate area of circle* you . First we declared PI variable and initialized it to 3.14 so it will work as constant for whole *program to calculate area* and circumference of *circle. This C++ Program which computes area of circle. The program takes radius of the circle as an input, calculates the area of the circle. *