prog.11.9.c

// More on pointers and funcitons

#include <stdio.h>

void exchange (int * const pint1, int * const pint2)
{
	int temp;

	temp = *pint1;
	*pint1 = *pint2;
	*pint2 = temp;
}

int main (void)
{
	void exchange (int * const pint1, int * const pint2);
	int i1 = -5, i2 = 66, *p1 = &i1, *p2 = &i2;

	printf ("i1 = %i, i2 = %i\n", i1, i2);

	exchange (p1, p2);
	printf ("i1 = %i, i2 = %i\n", i1, i2);

	exchange (&i1, &i2);
	printf ("i1 = %i, i2 = %i\n", i1, i2);

	return 0;
}