【c语言】关于+1的各种情况

// 关于+1的各种情况

#include <stdio.h>

//默认对齐数为4
// 结构体大小为16
struct BBB
{
	long A1;
	char A2;
	char A3;
	long A4;
	long A5;
};

int main()
{
	struct BBB *p;
	p = (struct BBB *)0x100000;
	printf("%x\n", p + 0x1);//p是结构体指针，加1加了一个结构体大小，即0x100010
	printf("%x\n",(unsigned long) p + 0x1);// p是无符号长整型，加1即加1，即0x100001
	printf("%x\n", (unsigned long *)p + 0x1);// p是无符号长整型指针，加1即加一个指针大小4，即0x100004
	printf("%x\n",(char *)p + 0x1);// p是字符指针，加1即加字符指针大小1，即0x100001
	return 0;
}

<img src="http://img.blog.csdn.net/20150508212801140?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvemhhb3lhcWlhbjU1Mg==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />