/*
//////////////////////////////////////////////////////////////////
//                   Sample #1: by value
//		  Sending variables by value.
//////////////////////////////////////////////////////////////////
*/

#include <stdio.h>


int max_plus( int, int );


int main (){
	int x = 31;
	int y = 513;

	z = max_plus( x, y );

	printf("The max of %d and %d is %d\n", x, y, z );

	return 0;
}


int max_plus( int a, int b ){
	int temp;

	printf("In MAX:\n");
	printf("FORMAL Parameters: At the Start\n");
	printf("The first parameter = a.");
	printf("  The value of a = %d\n", a );
	printf("The second parameter= b" );
	printf("  The value of b = %d\n\n", b );

	if( a > b )
		temp = a;
	else
		temp = b;

	a += 10;
	b += 20;

	printf("In MAX:\n");
	printf("FORMAL Parameters: At the Start\n");
	printf("The first parameter = a.");
	printf("  The value of a = %d\n", a );
	printf("The second parameter= b" );
	printf("  The value of b = %d\n\n", b );

	printf("Did a and b change?\n");

	return( temp );
}





-----------------------cut here----------------------------


/*
//////////////////////////////////////////////////////////////////
//                   Sample #2: parameters
//		Sending variables by reference.
//
// The only difference between #1 and #2: 
//	#1 is by value
//	#2 is by reference
//////////////////////////////////////////////////////////////////
*/

#include <stdio.h>


int max_plus( int*, int* );


int main (){
	int x = 31;
	int y = 513;
	int z;

	printf("In Main:\n");
	printf("Actual Parameters: BEFORE the call\n");
	printf("The first parameter = Y.");
	printf("  The value of y = %d\n", y );
	printf("The second parameter= X" );
	printf("  The value of x = %d\n\n", x );

	z = max_plus( &x, &y );

	printf("In Main:\n");
	printf("Actual Parameters: AFTER the call\n");
	printf("The first parameter = Y.");
	printf("  The value of y = %d\n", y );
	printf("The second parameter= X" );
	printf("  The value of x = %d\n\n", x );

	printf("Did x and y change?\n");

	printf("The max of %d and %d is %d\n", x, y, z );

	return 0;
}


int max_plus( int *a, int *b ){
	int temp;

	printf("In MAX:\n");
	printf("FORMAL Parameters: At the Start\n");
	printf("The first parameter = a.");
	printf("  The value of a = %d\n", *a );
	printf("The second parameter= b" );
	printf("  The value of b = %d\n\n", *b );

	if( *a > *b )
		temp = *a;
	else
		temp = *b;

	*a += 10;
	*b += 20;

	printf("In MAX:\n");
	printf("FORMAL Parameters: At the Start\n");
	printf("The first parameter = a.");
	printf("  The value of a = %d\n", *a );
	printf("The second parameter= b" );
	printf("  The value of b = %d\n\n", *b );

	printf("Did a and b change?\n");

	return( temp );
}