Question

Creat a simple calendar programming that can print the month of any year

Please C language C++ thank you

Answer 1

c program for printing the month of any year:-

code :-

//header files declaration
#include <stdio.h>
#include <stdlib.h>

//function declarations
int checkLeapYear( int year );      
long days( int y, int m, int d);
int leapYears( int year );       
int todayOf( int y, int m, int d);
void calendar(int y, int m);     

//main function
int main(int argc, char* argv[]){
    int year,month;
    char choice;
    while(1) {
      printf("1. Print calendar of a month\n");
      printf("2. Exit\n");
      printf("Enter your choice: ");
      scanf("\n%c", &choice);
      switch(choice)
      {
        case '1':
           printf("Enter the month and year: ");
           scanf("%d %d", &month, &year);
           calendar(year, month);
           break;
       case '2':
           printf("Bye!!");
           exit(0);
           break;
        default:
           printf("Not a valid option\n");
           break;
      }
    }
    return 0;
}

// to check year is leap or not?
int checkLeapYear( int z){
    return(z % 400 == 0) || ((z % 4 == 0) && (z % 100 != 0));
}
//count how many leap years
int leapYears( int y ){
    return y/4 - y/100 + y/400;
}

int todayOf( int y, int m, int d) {
    static int DayOfMonth[] =
        { -1,0,31,59,90,120,151,181,212,243,273,304,334};
    return DayOfMonth[m] + d + ((m>2 && checkLeapYear(y))? 1 : 0);
}

long days( int y, int m, int d){
    int lastYear;
    lastYear = y - 1;
    return 365L * lastYear + leapYears(lastYear) + todayOf(y,m,d);
}

// print calender format for the month
void calendar(int y, int m){
    int len=0, j, flag1 = 0;
    const char *NameOfMonth[] = { NULL/*dummp*/,
        "January", "February", "March", "April", "May", "June",
        "July", "August", "September", "October", "November", "December"
    };
    char dayWeeks[]= "Su   Mo   Tu   We   Th   Fr   Sa";
    int DayOfMonth[] =
        { -1,31,28,31,30,31,30,31,31,30,31,30,31 };
    int weekOfTopDay;
    int i,day;

    weekOfTopDay = days(y, m, 1) % 7;
    if(checkLeapYear(y))
        DayOfMonth[2] = 29;
    printf("\n    %s %d\n%s\n", NameOfMonth[m], y, dayWeeks);

    for(i=0;i<weekOfTopDay;i++)
        printf("     ");
    for(i=weekOfTopDay,day=1;day <= DayOfMonth[m];i++,day++){
        flag1 = 0;
        for (j = 0; j < len; j++) {
            printf("|%2d| ",day);
            flag1 = 1;
          
        }
        if (flag1 == 0) {
          printf("%2d   ",day);
        }
        if(i % 7 == 6)
            printf("\n");
    }
    printf("\n");
}

output:-

1. Print calendar of a month 2. Exit Enter your choice: 1 Enter the month and year: 05 2019 May 2019 Su Mo TuWe Th Fr Sa 4 2 5 6 78 9 1011 12 13 1415 161718 19 20 212223 24 25 26 27 28 29 30 31 1. Print calendar of a month 2. Exit Enter your choice: 2 Bye!!

C++ code:-

#include <iostream>
#include <cstdlib>
#include <iomanip>

using namespace std;

bool isLeapYear (int); //check the year is leap or not
int firstDayofFirstMonth (int );
int noofDaysInMonth (int, bool); // takes the number of the month, a flag saying whether the year is leap
void UpdateMonth (int); // takes the number of the month, and the first day, prints, and updates
void printMonth (int, int&); // the first day of the next month
void skip (int);// prints the specified amount of spaces
void skipToDay (int);// prints spaces in monthly calendar
void exitFunction (); // terminates program in case of Errors

int main ()
{
    int year, firstDayInPresentMonth;
    int currentMonth = 1;
    int numDays;
    bool leap;
    cout << "What year do you want a calendar for? ";
    cin >>year;
    cout<<endl;
    firstDayInPresentMonth=firstDayofFirstMonth(year);
    leap = isLeapYear(year);
    skip(9);
    cout << year << endl;
    while (currentMonth <= 12)
    {
    numDays = noofDaysInMonth(currentMonth, leap);
    UpdateMonth(currentMonth);
    printMonth(numDays, firstDayInPresentMonth);
    cout << endl << endl << endl;
    currentMonth = currentMonth + 1;
    }
    cout << endl;
}
bool isLeapYear (int year)
{
    return   ((year%4==0) && (year%100 !=0))||(year%400==0) ;     
}
int firstDayofFirstMonth(int year)
{
    int day_start;
    int x1, x2, x3;
    x1 = (year - 1)/ 4;
    x2 = (year - 1)/ 100;
    x3 = (year - 1)/ 400;
    day_start = (year + x1 - x2 + x3) %7;
    return day_start;
}
int noofDaysInMonth (int m, bool leap)
{
    if (m == 1) return(31);
    else if (m == 2) if (leap) return(29);else return(28);
    else if (m == 3) return(31);
    else if (m == 4) return(30);
    else if (m == 5) return(31);
    else if (m == 6) return(30);
    else if (m == 7) return(31);
    else if (m == 8) return(31);
    else if (m == 9) return(30);
    else if (m == 10) return(31);
    else if (m == 11) return(30);
    else if (m == 12) return(31);
    else exitFunction();
    return 0;
}
void UpdateMonth (int m)
{
    if (m == 1)
    {
    skip(7);
    cout << "January" << endl;
    }
    else if (m == 2) { skip(7); cout << "February" << endl; }
    else if (m == 3) { skip(7); cout << "March" << endl; }
    else if (m == 4) { skip(7); cout << "April" << endl; }
    else if (m == 5) { skip(7); cout << "May" << endl; }
    else if (m == 6) { skip(7); cout << "June" << endl; }
    else if (m == 7) { skip(7); cout << "July" << endl; }
    else if (m == 8) { skip(7); cout << "August" << endl; }
    else if (m == 9) { skip(7); cout << "September" << endl; }
    else if (m == 10) { skip(7); cout << "October" << endl; }
    else if (m == 11) { skip(7); cout << "November" << endl; }
    else if (m == 12) { skip(7); cout << "December" << endl; }
    else exitFunction();

    cout << " S M T W T F S" <<endl;
    cout << "____________________" << endl;
}
void skip (int i)
{
    while (i > 0)
    {
    cout << " ";
    i = i - 1;
    }
}
void printMonth (int numDays, int &weekDay)
{
    int day = 1;
    skipToDay(weekDay);
    while (day <= numDays)
    {
    cout << setw(2) << day << " ";
    if (weekDay == 6)
    {
        cout << endl;
        weekDay = 0;
    }
    else weekDay = weekDay + 1;
    day = day + 1;
    }
}
void skipToDay (int d)
{
    return skip(3*d);
}
void exitFunction ()
{
    cout << "exitFunction! Exiting ..." << endl;
    exit ( -1);
}

output:-

print all months in a given input year

What year do you want a calendar for? 2019 2019 January S M TWTF S 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 S M TWTF S 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