Return a double value from a function : function return « Function « C++ Tutorial

1. C++ Tutorial
2. Function
3. function return

#include <iostream> 
using namespace std; 
 
double box(double length, double width, double height); // use double data 
 
int main() 
{ 
  double answer; 
 
  answer = box(10.1, 11.2, 3.3); // assign return value 
  cout << "The volume is " <<  answer; 
 
  return 0; 
} 
 
// This version of box uses double data. 
double box(double length, double width, double height) 
{ 
  return length * width * height ; 
}

The volume is 373.296