#include<dos.h> #include<stdio.h> main() { int year,month; printf("please input the year\n"); scanf("%d",&year); printf("please input the month"); scanf("%d",&month); calendar(year,month); } int leap(year) int year; { int leap=0; if(year/100==0&&year/400==0) leap=1; if(year/100==0&&year/4==0) leap=1; return(leap); }   int get_days(year,month,date)   int year,month,date;   {    int i;    int m[]={0,31,28,31,30,31,30,31,31,30,31,30,31};    int sum=0;    if(leap(year)) m[2]=29;    for(i=1;i<month;i++)     sum+=m[i];     sum+=date;     return(sum);     }  int get_week(year,month,date)    int year,month,date;    {     int week;      week=(year-1)+(year-1)/100-(year-1)/400+(year-1)/1000;      week+=get_days(year,month,date);      week%=7;      return(week);      }   calendar(year,month)   int year,month;   {    int i,j;    int line=13;    int m[]={0,31,28,31,30,31,30,31,31,30,31,30,31};     if(leap(year)) m[2]=29;     printf("%d.%d\n",year,month);     printf("****************************\n");     printf("SUN MON TUE WEN THU FRI SAT\n");     for(j=1;j<=get_week(year,month,1)*4;j++)       printf(" ");     for(i=1;i<=m[month];i++)      {       printf("%d",i);       if(i>=10)       printf("  ");       else       printf("   ");       if(get_week(year,month,i)==6)       printf("\n");       }       printf("\n****************************\n");     }

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