Function Problem 01

#include <iostream>
using namespace std;

float area(float radius_circle);
float area(float radius_circle)
{
   float area_circle;
   area_circle = 3.14 * radius_circle * radius_circle;

   return area_circle; //return area
 }

int main() {
   float r;

   cin >> r;

   cout << "Area of circle: " << area(r) << endl;

   return 0;
}