C++ area & circumference of a circle
int rad;
float area, circum;
cout << "Input the radius(1/2 of diameter) of a circle: ";
cin >> rad;
area = 3.14 * rad * rad; // 3.14 * (rad * rad);
circum = 2 * 3.14 * rad;C++ area & circumference of a circle
int rad;
float area, circum;
cout << "Input the radius(1/2 of diameter) of a circle: ";
cin >> rad;
area = 3.14 * rad * rad; // 3.14 * (rad * rad);
circum = 2 * 3.14 * rad;Area of a Circle in C++ Programming
#include <iostream>
#include <iomanip>
using namespace std;
int main(){
double R,A;
cin >> R;
A = 3.14159 * R * R;
cout << "A=" << fixed << setprecision(4) << A << endl;
return 0;
}Copyright © 2021 Codeinu
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