#include <stdio.h>
	void swap ( int* p, int* q ) {
		int temp;
		temp = *p;
		*p = *q;
		*q = temp;
	}
	
	int main ( int argc, char* argv[] ) {
		int a = 101;
		int b = -2;
		int* pa;
		int* pb;
		int* ptemp;
	
1		printf( "\nThis is the output from %s:\n\n", argv[0] );
	
		printf( "To begin, a is %d, b is %d\n", a, b );
		swap( &a, &b );
		printf( "After swap(&a, &b), a is %d, b is %d\n", a, b );
	
		pa = &a;
		pb = &b;
	
2		printf( "\nNow pa points to an object with value %d,"
2		   "\nand pb points to an object with value %d\n", *pa, *pb );
		swap( pa, pb );
3		printf( "After swap(pa, pb), a is %d, b is %d\n", a, b );
		printf( "And pa points to an object with value %d,"
		   "\nand pb points to an object with value %d\n", *pa, *pb );
	
		ptemp = pa;
		pa = pb;
		pb = ptemp;
4		printf( "\nAfter swaping pa and pb,\npa points to an object with value %d,"
		   "\nand pb points to an object with value %d\n", *pa, *pb );
		printf( "But a is %d, b is %d\n", a, b );
		return (0);
	}