/*example2-3.c*/
#include<stdio.h>
main()
{	int year,month,day;

	printf("Enter year & month:");
	scanf("%d%d",&year,&month); /*输入年份和月份*/
	if (month==2)	/*判断输入的月份是否为二月份*/
		if ((year%4==0&&year%100!=0)||(year%400==0)) /*是二月份，判断是否为闰年*/
			day=29;
		else day=28;
	else	/*不是二月份，则区分判断各月的天数*/
		switch (month)
		{
			case 1:	case 3:
			case 5:	case 7:
			case 8:	case 10:
			case 12: day=31;	break;		/*多个case公用一个语句*/
			case 4:	case 6:
			case 9:	case 11: day=30;	break;
		}
	printf("year=%d	month=%d	day=%d\n",year,month,day);
}