// Dick.
// Date Sun Apr 23 11:31:41 PDT 1995
// Updated Wed Apr 16 14:40:04 PDT 1997
// Teaching how functions work

/* 
This program shows you how a functions work in expressions.
It shows that you don't have to store a value before printing it.

The calculation is not very exciting.... 

Can you figure out why it outputs what it does output?
*/

#include <iostream.h>

void main( )  //As described in the Annotated Ref Manual
{ 
  //Use the following functions
	int odd(int); int half(int); int dubl(int); int trbl(int);
	int next(int);

        cout<<"4 * 2 ="<<dubl(dubl(2))<<endl;

        cout<<"6 * 2 ="<<trbl(dubl(2))<<endl;
 
	cout<< "odd(half(dubl(next(0)))) is " <<odd(half(dubl(next(0)))) <<endl;
}

int odd(int n)
// Returns: 1 if n is Odd and 0 if n is even.
{
	return n%2;
}
int half(int n)
{
	return n/2;
}
int dubl(int n)
{
	return n+n;
}
int trbl(int n)
{
	return dubl(n)+n;
}
int next(int n)
{
	return n+1;
}