#include?<stdio.h>
int?isly(int?year)?
{
return?((!(year%4))&&(year%100)||(!(year%400)));
}
int?mtod(int?m)?
{
int?n=0;
switch(m)
{
case?1:n=31;break;
case?2:n=59;break;
case?3:n=90;break;
case?4:n=120;break;
case?5:n=151;break;
case?6:n=181;break;
case?7:n=212;break;
case?8:n=243;break;
case?9:n=273;break;
case?10:n=304;break;
case?11:n=334;break;
default:n=0;
}
return?n;
}
int?dmax(int?y,int?m)
{
if(m==2)
{
return?28+(isly(y));
}
if((m==1||m==3||m==5||m==7||m==8||m==10||m==12))
return?31;
return?30;
}
int?day(int?y,int?m)
{
int?lyn=0;?
int?dn=0;?
int?weekday;
static?int?aday[7]={2,3,4,5,6,0,1};
if(y>=1901)
{
for(int?i=1901;i<=y;i++)
{
lyn+=isly(i);
}
if(isly(y))
{
if(m<=2)?
lyn--;
}
dn=(y-1901)*365+mtod(m-1)+lyn;
weekday=aday[dn%7];
}
if(y<1901)
{
for(int?i=y;i<1901;i++)
{
lyn+=isly(i);
}
if(isly(y))
{
if(m>2)
lyn--;
}
dn=(1901-y)*365-mtod(m-1)+lyn;
weekday=aday[dn%7];
}
return?weekday;
}
void?printdate(int?y,int?m,int?wd)
{
int?cd=dmax(y,m);
int?mdate[40]={0};
printf("?日?壹?二?三?四?五?六\n");
for(int?i=0;i<cd;i++)
{
mdate[i+wd]=i+1;
}
for(int?i=0;i<cd+wd;i++)
{
if(mdate[i]==0)
printf("");
else
printf("%3d",mdate[i]);
if((i+1)%7==0)
printf("\n");
}
printf("\n");
}
int?main()
{
int?y,m;
printf("輸入年月:");
do
{
scanf("%d%d",&y,&m);
if(m<13&&m>0)
{
printf("\n");
printdate(y,m,day(y,m));
break;
}
else
printf("輸入不合法，請重新輸入:");
}
while(1);
return?0;
}