//--------------------------------------------------------------
//	demo1.c
//
//	This very simple application program merely adds two
//	specified integers and prints out the resulting sum.
//	It is written using the C programming language, just
//	to illustrate the distinction between a "high-level"
//	language and a "low-level" language (like assembly).
//	This demo should be compared with 'demo2.s' which is    
//	a "low-level" version of the very same computation.
//
//	compile using:	$ gcc demo1.c -o demo1
//
//	programmer: ALLAN CRUSE
//	written on: 27 AUG 2003
//	revised on: 25 JAN 2005 -- to use sprintf() and write()
//--------------------------------------------------------------

#include <stdio.h>		// needed for 'printf()'

#define device_id 	1	// standard output file

int	x = 4, y = 5;		// initialized variables
int	z, len;			// uninitialized variables
char	buf[80];		// uninitialized array

int main()
{
	z = x + y;		// assignment statement

	// call to library-function
	len = sprintf( buf, "%d + %d = %d \n", x, y, z );

	// system-call to OS kernel
	write( device_id, &buf, len ); 
}