// Fig. 3.4: fig03_04.cpp
// Finding the maximum of three floating-point numbers.
#include <iostream>
     
using std::cout;
using std::cin;
using std::endl;
     
double maximum( double, double, double ); // function prototype
    
int main()
{
  double number1;
  double number2;
  double number3;
    
  cout << "Enter three floating-point numbers: ";
  cin >> number1 >> number2 >> number3;
    
  // number1, number2 and number3 are arguments to 
  // the maximum function call
  cout << "Maximum is: " 
       << maximum( number1, number2, number3 ) << endl;
    
  return 0;  // indicates successful termination
} // end main
    
// function maximum definition;                 
// x, y and z are parameters                    
double maximum( double x, double y, double z )  
{                                               
  double max = x;   // assume x is largest     
                                                    
  if ( y > max )    // if y is larger,         
    max = y;       // assign y to max         
                                                    
  if ( z > max )    // if z is larger,         
    max = z;       // assign z to max         
                                                    
  return max;       // max is largest value    
                                                    
} // end function maximum