C Language Implementation Calendar output

This is still very practical ....

Header file:

#ifndef Main_h#defineMain_h#include"stdio.h"#include"math.h"#include"stdlib.h"//get the maximum number of days for a one monthintMonthDay (int,int );//Judging leap Year, is returning 1, not returning 0intIsleapyear (int );#endif 

Main function:

#include"Main.h"intMain () {intYear,month,days,weekday; inti,d;  while(1) {printf ("Please input the year:\n"); scanf ("%d",&Year ); days= year-1+ (year-1)/ -+ (year-1)/4-(year-1)/ -;//calculate the first day of the year is the days of the week                 for(month=1; month<= A; month++) {printf ("\t\t****%d year--%d month ****\n", Year,month); printf ("sun\tmon\ttues\twed\tthur\tfir\tsat\t\n");//Table Headeri =1; D =1; Weekday= (days +1)%7;//ask for the day of the week             while(I<=weekday)//output the preceding space{printf ("\ t"); I++; }                          while(D<=monthday (Month,year))//Output Date{Weekday= (days +1)%7; if(weekday==6)//The last one is Saturday, and the output will be wrapped.printf"%d\n", D); Else             //No line break after Saturday outputprintf"%d\t", D); if(d==MonthDay (month,year)) printf ("\ n"); D++; days++; }        }    }    }

function function Implementation:

#include"Main.h"intMonthDay (intMonthintYear ) {    Switch(month) { Case 1:             Case 3:             Case 5:             Case 7:             Case 8:             Case Ten:             Case  A:            return  to; Break;  Case 4:             Case 6:             Case 9:             Case  One:            return  -; Break;  Case 2:            if(Isleapyear (year)) {return  in;//leap year 29 days                 Break; }            Else            {                return  -;  Break; }                    }     }intIsleapyear (intYear ) {    if((year%4==0) && (year% -!=0)|| (year% -==0))        return 1; Else         return 0;}

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C Language Implementation Calendar output