日历的C代码

//输入某年第一天是周几，输出整年日历
#include<stdio.h>
void main()
{
 int week,day,month,year,i,monthday[13];
 printf("year（xxxx） ：");
 scanf("%d",&year);
 printf("\nthe first day of this year（0=sun，1=mon，。。。。，6=sat）：");
 scanf("%d",&week);
 printf("\n*******the calender of %4d********",year);
  for(month=1;month<=12;month++)
  {
  
   if(month==4||month==6||month==9||month==11)  monthday[month]=30;
   else {if(month==2)
             if(((year%4)==0) && ((year%100)!=0) || ((year%400==0)))
              monthday[month]=29;
             else 
              monthday[month]=28;
          else  
  monthday[month]=31;
  }

   
   printf("\n========the month of %2d========\n",month);
   printf(" sun  mon tue wed thu fri sat\n");
   for(i=0; i<week;i++)
    printf("%4c", '  ');
   for(day=1; day<=monthday[month]; day++)
   {