C语言指针的理解

// demo1.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include 

int i ;


void ch (int* a, int* b){

	int p ;

	p = *a ;
	*a = *b ;
	*b = p ;
}


int main()


{



	int i = 3 ;
    int j = 5 ;

	ch(&i,&j) ;
	printf("%dn",i ) ;


	return 0;
}