二级指针基础知识

/*
 ============================================================================
 Name        : TestDoublePointer.c
 Author      : lf
 Version     :
 Copyright   : Your copyright notice
 Description : 二级指针基础知识
 ============================================================================
 */

#include <stdio.h>
#include <stdlib.h>

void test();

int a=9527;
int b=1313;

int main(void) {
	test();
	return EXIT_SUCCESS;
}

void test(){
	printf("&a=%x\n",&a);
	printf("&b=%x\n",&b);
	printf("===========\n");

	int *pa=&a;
	int **pp=&pa;
	//二级指针本身的地址
	printf("pp=%x,\n",pp);
	//二级指针中保存的地址
	printf("*pp=%x,\n",*pp);
	//根据二级指针取出内容
	printf("**pp=%d\n",**pp);
	printf("===========\n");

	testDoublePointer(pp);

	printf("**pp=%d\n", **pp);
	printf("pp=%x,\n", pp);
	printf("*pp=%x,\n", *pp);
	printf("**pp=%d\n", **pp);
	printf("===========\n");
}

/**
 * 重新给二级指针赋值
 */
void testDoublePointer(int **pp){
	*pp=&b;
}