constant floats, floating point variables : float « Data Types « C++ Tutorial

1. C++ Tutorial
2. Data Types
3. float

#include <iostream>                  
using namespace std;   
  
int main(){   
   float rad;                        
   const float PI = 3.14159F;        
  
   cout << "Enter radius of circle: ";
   cin >> rad;                        
   float area = PI * rad * rad;         
   cout << "Area is " << area << endl;
   return 0;   
}