Circle class (2)

#include <iostream>

struct Circle{
   float area;
   float radius;

   Circle(float r): //c'tor
   radius(r),
   area(3.14 * r * r)
   {}
};

int main(){

   Circle c(3.16227766);
   std::cout << c.area << " (should be 31.4)" << std::endl;
}