Making a Calendar in C++

[munchlaxxx]

Any ideas of how I can have a calendar for all 12 months print for any year?
The user inputs the year and the day of the week for January 1st of that year. (Sunday = 0, Monday = 1, etc.)

Important:
I cannot use cases. (That's what I've mostly seen online to solve this problem)
I can only use <iostream>, no other libraries.
And I am supposed to use two for loops.

Could someone provide a pseudocode or any suggestions?

[deceptikon]

Well, you know how many days are in each month, and what weekday the year starts, so the algorithm stands out immediately as a couple of nested loops with a few counters that wrap around at appropriate times. You're looking at around 10 lines of code.

Don't over complicate things, this is almost a no brainer. Of course handling leap years and error handling the weekday input are both minor complications, but it's not a big deal. See if you can come up with an algorithm on your own.

[munchlaxxx]

So far, I have the beginning of the program and then a few random pieces lol...

#include <iostream>
using namespace std;




int main()
{
int year;
int day;
int month = 1;
int i;

cout << "Calendar Program" << endl << endl;
cout << "Please enter the year: ";
cin >> year;
if (year < 0)
{cout << "The year must be greater than or equal to 0!" << endl;
return 0;}
cout << "Please enter the day of the week of January 1st." << endl;
cout << "Enter 0 for Sunday, 1 for Monday, ..., 6 for Saturday: ";
cin >> day;
if (day < 0 || day > 6)
{cout << "The day of January 1st must be between 0 and 6!" << endl;
return 0;}

cout << endl << endl;






//random pieces


for (int i = 1; i < day; ++ i) 
{cout << " ";}                //This is for the spaces at the beginning of the month (if the first day isn't a Sunday)



for (month = 1; month <= 12; month++) //print out months
{ if (month == 1)
{cout << "January";}
if (month == 2)
{cout << "February";} //etc

}

for (year = 1; year <= 100000000; year++) //leap year
{
if (year % 4 == 0 && year % 100 != 0)
{}                                      //print February with 29 days
return 0;}



}





return 0;
}

Am I on the right track at least? I still have no idea how to actually print a month.

[deceptikon]

Am I on the right track at least?

Yes.

I still have no idea how to actually print a month.

Here's an example of what I was talking about:

#include <iomanip>
#include <iostream>

using namespace std;

int main(void)
{
    const int mdays[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    int wday = 3;

    // Print this year's calendar
    for (int month = 0; month < 12; ++month) {
        // Print leading blanks for last month
        for (int i = 0; i < wday; ++i)
            cout << setw(3) << "";

        // Print this month's calendar
        for (int mday = 0; mday < mdays[month]; ++mday, ++wday) {
            if (wday == 7) {
                cout << '\n';
                wday = 0;
            }

            cout << setw(3) << mday + 1;
        }

        // Set up for the next month
        if (wday != 7) {
            // Avoid one too many blank lines if the 
            // month ends a linebreaking weekday
            cout << '\n';
        }

        cout << endl;
    }
}

[munchlaxxx]

Is there a way without using #include <iomanip>? We haven't learned that yet

[dx9_programmer]

You don't need the iomanip header file. It just allows you to format your code nicely. So to make the above code work, just remove functions like setw(number_here) and it should compile.

[munchlaxxx]

Oh okay, thank you

[munchlaxxx]

Okay, I made more progress. And decided to use the iomanip :p
This is what I get: http://i.imgur.com/9ypos.jpg
Can someone please tell me how to get the month names all aligned to the left? And how to fix the alignment of the first week?

#include <iostream>
#include <iomanip>
using namespace std;




int main()
{
int mdays[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
int DaysinWeek = 0;
int year;
int day;
int FirstDayOfMonth = 0;
int month = 1;



cout << "Calendar Program" << endl << endl;
cout << "Please enter the year: ";
cin >> year;
if (year < 0)
{cout << "The year must be greater than or equal to 0!" << endl;
return 0;}
cout << "Please enter the day of the week of January 1st." << endl;
cout << "Enter 0 for Sunday, 1 for Monday, ..., 6 for Saturday: ";
cin >> day;
if (day < 0 || day > 6)
{cout << "The day of January 1st must be between 0 and 6!" << endl;
return 0;}

cout << endl << endl;






// Print this year's calendar
for (int month = 0; month < 12; ++month) {
{

for (int i = 0; i < DaysinWeek; ++i)
{cout << setw(3) << " ";}


if (month == 0)
{cout << "January \n";}

if (month == 1)
{cout << "February \n";
 if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))
mdays[1] = 29;}

if (month == 2)
{cout << "March \n";}

if (month == 3)
{cout << "April \n";}

if (month == 4)
{cout << "May \n";}

if (month ==5)
{cout << "June \n";}

if (month == 6)
{cout << "July \n";}

if (month == 7)
{cout << "August \n";}

if (month == 8)
{cout << "September \n";}

if (month == 9)
{cout << "October \n";}

if (month == 10)
{cout << "November \n";}

if (month == 11)
{cout << "December \n";}

}


//spaces
for (int i = 0; i < day; i++)
    {cout << "  ";

}

  //Determine where the first day begins
day = 0;
    for (FirstDayOfMonth; FirstDayOfMonth < day; ++FirstDayOfMonth)
    {   
        cout << setw(3);
    } 








// Print this month's calendar
for (int mday = 0; mday < mdays[month]; ++mday) {
cout << setw(3) << mday + 1;
DaysinWeek++;

if (DaysinWeek == 7) {
cout << "\n" << setw(3);
DaysinWeek = 0;
}

}

// Set up for the next month
if (DaysinWeek != 7) {
cout << "\n";
}

cout << endl;
day = DaysinWeek + 1;
}



return 0;
}

[munchlaxxx]

I have a feeling that there should be a part that says:
If the spaces + DaysinWeek == 7, "\n". Is that right? I can't figure out where to put it though...

[munchlaxxx]

Do I need to create another function(s)?

[0igo]

hey can you please help me out! do you still have this file completed anywhere? please let me know. i would love to see it. i have the same problem and i cannot get numbers to loop after they hit saturday they just go on forever. Please help me. thanks