#include<stdio.h>

void screen();           /*系统主界面*/

void whatisit();         /*查询某年某月某日是星期几*/

void leapyear();         /*查询某年是否为闰年*/

void printyearday();     /*打印某年的全年日历*/

int IsLeapYear(int);     /*判断某年是否为闰年*/

int whatisita(int,int);  /*计算当天是星期几*/

int everymonth(int,int); /*查询某月最大天数*/

void printmonth(int,int); /*打印某年某月月历*/

void printmonthday()      /*打印某年的某月最大天数*/

/*定义指针数组*/

  void main()

{

  char* week[]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};

  screen();

 } 

 /*万年历查询主界面（含部分功能）*/

 void screen()

 {

  int n;

  while (1)

  {

  printf("万年历查询程序:\n");

  printf("1.查询某年某月某日是星期几\n");

  printf("2.查询某年是否是闰年\n");

  printf("3.打印某年的全年日历\n");

  printf("4.查询某月的最大天数\n");

  printf("5.退出\n");

  printf("请输入要查询的选项:");

  scanf("%d",&n);

  switch(n)

  {

  case 1:whatisit();break;

  case 2:leapyear();break;

  case 3:printyearday();break;

  case 4:printmonthday();break;

  case 5:return;

  default:printf("你输入错误,请按要求输入!!!\n");break;

}

}

  }