C语言中的sizeof

#include "stdio.h"
void main()
{
	char str[20];
	struct date
	{
		int year,month,day;
	}today;
	struct address
	{
		char name[30],street[40],city[20],state[2];
		unsigned long int zip;
	}xiong;
	printf("char:%d\t",sizeof(char));
	printf("int:%d\t",sizeof(int));
	printf("long:%d\t",sizeof(long));
	printf("float:%d\n",sizeof(float));
	printf("double:%d\t",sizeof(double));
	printf("str:%d\t",sizeof(str));
	printf("date:%d\t",sizeof(struct date));
	printf("today:%d\n",sizeof(today));
	printf("xiong:%d\n",sizeof(xiong));
}