指针是强类型的,需要特定类型的指针来存放特定类型变量的地址.

指针作用: 储存内存地址; 解引用那些地址的内容(访问和修改地址中的值)

一、整形,字符型指针输出:

#include <stdio.h>

int main(int argc, const char* argv[])
{
	int a = 1025;
	int* p;
	p = &a;
	printf("size of integer is %d bytes\n", sizeof(int));
	printf("Address = %d,value = %d\n", p, *p);
	printf("Address = %d, value = %d\n", p + 1, *(p + 1));//算术运算
	
    
    
    
    char* p0;
	p0 = (char*)p;
	printf("size of cahr is %d bytes\n", sizeof(char));
	//字符型,最后一串只有一个字节,所以这里只打印出1
	// 1025 = 00000000 00000000 00000100 00000001
	printf("Address = %d, value = %d\n", p0,*p0);
	printf("Address = %d, value = %d\n", p0+1, *(p0+1));//算术运算
}

唯一的指针算术运算,以整数值的大小增加或减少指针值

二、void 类型的声明:

只可以打印其中的地址,

取其中的值和进行算术运算都会导致程序无法运行.

int main(int argc, const char* argv[])
{
	int a = 1025;
	int* p;
	p = &a;
	//printf("size of integer is %d bytes\n", sizeof(int));
	//printf("Address = %d,value = %d\n", p, *p);
	//printf("Address = %d, value = %d\n", p + 1, *(p + 1));
	
	
	void* p0;
	p0 = p;
	printf("Address = %d", p0);
}