Question

Write a C# program that prints a calendar for a given year. Call this program calendar. The program prompts the user for two inputs:

      1) The year for which you are generating the calendar.
      2) The day of the week that January first is on, you will use the following notation to set the day of the week:

     

      0 Sunday                     1 Monday                   2 Tuesday                   3 Wednesday
      4 Thursday                 5 Friday                      6 Saturday

Your program should generate a calendar similar to the one shown in the example output below. The calendar should be printed on the screen. Your program should be able to handle leap years. A leap year is a year in which we have 366 days. That extra day comes at the end of February. Thus, a leap year has 366 days with 29 days in February. A century year is a leap year if it is divisible by 400. Other years divisible by 4 but not by 100 are also leap years.

Example: Year 2000 is a leap year because it is divisible by 400.  Year 2004 is a leap year because it is divisible by 4 but not by 100.

Your program should clearly describe the functionality of each function and should display the instructions on how to run the program.

Your need to create one method “displayMonth” for print each month as required. You can choose return method or not that depend on your design.

Sample Input:

Enter the year for which you wish to generate the calendar: 2004
Enter the day of the week that January first is on: 4

Sample output:

Calendar for year 2004

January
Sun      Mon     Tue      Wed     Thu      Fri        Sat
                                                1          2          3
4          5          6          7          8          9          10
11        12        13        14        15        16        17
18        19        20        21        22        23        24
25        26        27        28        29        30        31

February
Sun      Mon     Tue      Wed     Thu      Fri        Sat
1          2          3          4          5          6          7
..         ..          ..          ..          ..          ..          ..
..          ..

Answer 1

Summary: Program Saved as Calendar.c

After running it ask for year, after entering year it will prompt for starting day( with suggestion) and display whole year calendar as required. "displaymonth" method is declared having no return type and with two parameter year and fday. Comments are placed to explain functionality

#include<stdio.h>

int mdays[]={31,28,31,30,31,30,31,31,30,31,30,31}; //Days in month for all 12 months
char *mname[]={"January","February","March","April","May","June","July","August","September","October",   "November",   "December"};

void displaymonth(int year, int fday)
{
   int month, day;
   for ( month = 0; month <= 11; month++ )
   {
       printf("%s", mname[month]);//Displaying month Name
       printf("\nSun Mon Tue Wed Thu Fri Sat\n" );//printing Day Headers
       for ( day = 1; day <= 1 + fday * 5; day++ )//adjustment for first day
       {
           printf(" ");
       }
       for ( day = 1; day <= mdays[month]; day++ )//printing all days in month
       {
           printf("%2d", day );
           if ( ( day + fday ) % 7 > 0 )//if first day is sunday start it on new line
               printf("   " );
           else
               printf("\n " );
       }
       printf("\n\n" );  
       fday = ( fday + mdays[month] ) % 7;//fday for next month
   }
}

int main(void)
{
   int year,fday;
   printf("Enter the year for which you wish to generate the calendar: ");
   scanf("%d", &year);
   printf("\nEnter the year for which you wish to generate the calendar: (0:Sunday 1:Monday 2:Tuesday 3:Wednesday 4:Thursday 5:Friday 6:Saturday): ");
   scanf("%d", &fday);
   if(year% 4 == 0 && year%100 != 0 || year%400 == 0)//checking for leap year
   {
       mdays[1] = 29;
   }
   else
   {
       mdays[1] = 28;
   }
   displaymonth(year,fday);//displaying each month
    return 0;
}