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Help with C++ homework!

chem major (16)
I'm in desperate need of help with a homework assignment. I have to write a program that will take the user's birthday and offer calculation options:
days user has been alive
days until next birthday
days until user is 87 years old

I've started writing the preliminary code, but I'm a little lost with all of the functions and how to implement them. Criticism, advice, or instructions are all GREATLY appreciated.

The code is given below: (I know I'm missing a few things as this is just a rough draft)

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//Homework 4
//Days of Our Lives
//Given a birthdate how many days has the user been alive, how many
// days until their next birthday, how many days until 87 

#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

enum MONTHS {JAN=1, FEB, MAR, APR, MAY, JUUN, JUL, AUG, SEPT, NOV, DEC};

int Current_Date(int current_month, int current_day, int current_year);
int Days_Alive(int month, int day, int year, int current_month, int current_day, int current_year,
                   int birth_year, int birth_month, int birth_day);
bool isLeap(int year);
int daysTilNextBday( int birth_day, int birth_month, int current_day, int current_month, int current_year, int year);
int daysInMonth(int month, int year);
int get_Birthday(int birth_month, int birth_day, int birth_year);
int daysInYear(int year);
int thisYear(int current_year);
int thisDay(int current_day);
int thisMonth(int current_month);
int bDay(int birth_day);
int bMonth(int birth_month);
int bYear(int birth_year);

char menu_choice;
char MainMenu(char shape_choice);
char Table_of_Contents();

int main()
{
    int month, day, year, current_month, current_day, current_year, birth_day, birth_month, birth_year, end_month, end_day, end_year;
    char exit;
    
    cout << "Hello! Welcome to The Days of Our Lives Age Calculator!" << endl << endl;
    cout << "Using your birthday, this program can perform several calculations." << endl << endl << endl;
    cout << "Please choose from the following menu: " << endl << endl;
    cout << "To calculate how many days you have been alive, enter 'D'." << endl << endl;
    cout << "To calculate how many days until your next birthday, enter 'N'." << endl << endl;
    cout << "To calculate how many days until you reach four score and seven years (87 years old), enter 'F'." << endl << endl;
    cout << "To quit this program, enter 'Q'." << endl << endl;
    cin << menu_choice;
    
    return (menu_choice);
    
    do
    {
          exit = MainMenu(Table_of_Contents());
    }
    while((exit!= 'Q')&&(exit!='q'));
    system("PAUSE");
    return EXIT_SUCCESS;
    
    system("PAUSE");
    return EXIT_SUCCESS;
}

char MainMenu(char menu_choice)
{
     
     switch (menu_choice)
     {
           case 'D':
           case 'd':
                cout << "You chose to calculate how many days you've been alive." << int Days_Alive(int month, int day, int year, int current_month, int current_day, int current_year,
                   int birth_month, int birth_year, int birth_day);
                cout << endl << endl;
                break;
                        
           case 'N':
           case 'n':
                cout << "You chose to calculate how many days until your next birthday." << int daysTilNextBday(int birth_day, int birth_month, int birth_year, int current_day, int current_month, int current_year, int year);
                cout << endl << endl;
                break;
                        
           case 'F':
           case 'f':
                cout << "You chose to calculate how many days until you are four score and seven years old (87)." << AreaRectangle(get_length(), get_width());
                cout << endl << endl;
                break;

int get_Birthday(int birth_month, int birth_day, int birth_year){
    
    cout << "Please enter your Birthday. Use (1-12) for the months."  << endl;
    int bMonth(int birth_month);
    cout << "month: " << endl;
    int bDay(int birth_day);
    cout << "day: " << endl;   
    int bYear(int birth_year);
    cout << "year: " << endl;
    cout << "Your Birthday is: "<<birth_month<< " /"<<birth_day;
    cout << " / " << birth_year << endl << endl;
}

int Current_Date(int& current_month, int& current_day, int& current_year){    
    cout << "Please enter today's date." << endl;
    int thisMonth(int current_month);
    int thisDay(int current_day);
    int thisYear(int current_year);
    cout << "The Current Date is: "<< current_month << " /"<< current_day;
    cout << " / " << current_year << endl << endl;
}
bool divisibleBy( int number, int divisor){
     return number % divisor == 0;     
}

bool isLeap(int year) {
   bool leap(false);
   if (divisibleBy( year, 4) ){
         if(divisibleBy( year, 100)){
           if (divisibleBy( year, 400))
             leap = true;   
           else
             leap = false;
         }    
         else
           leap = true;       
   }
   else
         leap = false;         
       
       
       return leap;  
}    
int daysInFebruary(int year){
    int result(28);
    if ( isLeap(year))
      result = 29;
      
    return result;
}
/*int Days_in_Month(int month, int year)
{
    if(9==month || 4==month || 6==month || 11==month)
    {
                return 30;
    }
    else if (2==month)
    {
         if(is_Leap())
         return 29;
         else
         return 28;
    }
    else
    {
        return 31;
    }
}*/
chem major (16)
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int daysInMonth( int month, int year){
    int result(0);
    
    if (month == 9 || month == 4 || month == 6 || month == 11){
       result = 30;
    }
    else if ( month == 2){
        result = daysInFebruary(year); 
    }
    else {
        result = 31; 
    }
    
    return result;
}    

int currentDayNumber( int month, int day, int year){
    int result(0);
    
    // compute days of months passed:
    if ( month > 1)
       result = 31;
    if (month > 2)
       result = result + daysInFebruary(year);
    if (month > 3)
       result = result + 31;
    if (month > 4)
       result = result + daysInMonth(4, year);
    if (month > 5)
       result = result + 31;
    if (month > 6)
       result = result + 30;
    if (month > 7)
       result = result + 31;
    if (month > 8)
       result = result + 31;
    if (month > 9)
       result = result + 30;
    if (month > 10)
       result = result + 31;
    if (month > 11)
       result = result + 30;
       
    //add to result current day:
    result = result + day;
    
    return result;  
}

int daysInYear(int year){
   int result(365); 
   
   if (isLeap(year) == true){
      result = 366;
   }
   return result; 
}
int thisYear(int current_year){
    int result(0);
    cout<< "What year is it currently? " << endl;
    cin >> current_year;
    return result = current_year;
}
int thisDay(int current_day){
    int result(0);
    cout<< "What day number is it today? " << endl;
    cin >> current_day;
    return result= current_day;
}
int thisMonth(int current_month){
    int result(0);
    cout << "What month is it currently? " << endl;
    cin >> current_month;
    return result = current_month;
}
int bYear(int birth_year){
    int result(0);
    cout << "What year were you born in? " <<endl;
    cin >> birth_year;
    return result = birth_year;
}
int bMonth(int birth_month){
    int result(0);
    cout << "What month were you born in? " <<endl;
    cin >> birth_month;
    return result = birth_month;
}
int bDay(int birth_day){
    int result(0);
    cout << "What day were you born on? " <<endl;
    cin >> birth_day;
    return result = birth_day;
}
    

int Days_Alive(int current_month, int current_day, int current_year,
                   int birth_month, int birth_year, int birth_day)
{
    int result(0);
    cout << "Please enter the current month, the current day, and the current year, all separated by spaces only." << endl; 
    cout << "Example: Jan 1, 2013 = 1 1 2013" << endl << endl;
    cin >> current_month >> current_day << current_year;
    cout << "Please enter your birthdate, using the same format." << endl << endl;
    cin >> birth_month >> birth_day >> birth_year;
    
    result = (current_year - birth_year)*daysInYear + (current_month - birth_month)*daysInMonth + (current_day - birth_day)
    return cout << "You have been alive " << result << "days!";
}

int daysTilNextBday(int birth_day, int birth_month, int birth_year, int current_day, int current_month, int current_year, int year)
{
    int result(0);
    cout << "Please enter the current month, the current day, and the current year, all separated by spaces only." << endl; 
    cout << "Example: Jan 1, 2013 = 1 1 2013" << endl << endl;
    cin >> current_month >> current_day << current_year;
    cout << "Please enter your birthdate, using the same format." << endl << endl;
    cin >> birth_month >> birth_day >> birth_year;
  
    result = daysInYear(year) - get_Birthday(birth_month, birth_day, birth_year);
    return result;                    
}

int FourScoreSevenYears (int birth_month, int birth_day, int birth_year, int year)
{
    int result(0);
    cout << "Please enter the current month, the current day, and the current year, all separated by spaces only." << endl; 
    cout << "Example: Jan 1, 2013 = 1 1 2013" << endl << endl;
    cin >> current_month >> current_day << current_year;
    cout << "Please enter your birthdate, using the same format." << endl << endl;
    cin >> birth_month >> birth_day >> birth_year;
    
    result = daysInYear(year) - Days_Alive(int current_month, int current_day, int current_year,
                   int birth_month, int birth_year, int birth_day)
    return result;
Michaela Elise (117)
in main()

return (menu_choice);

will always return and exit your program

basically your whole menu is F'd in the A

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//in main

int day, month, year;

while(exit != 'q' || exit != 'Q')
{
  std::cout << "Enter the day you were born(dd): ";
  std::cin >> day;
  std::cout << "\nEnter the month you were born(mm): ";
  std::cin >> month;
  std::cout << "\nEnter the year you were born(yyyy): ";
  std::cin >> year;
  std::cout << '\n';

  //Continue to do stuff here

//Now you have some of your necessary parameters that you need to pass to your functions
}

return 0;



You always need these 3 numbers, to get the current year, if you are using windows look into the tm struct, you can populate it with one function call and then it is as easy as tm->day, tm->year etc...
Last edited on
TheIdeasMan (6817)
The function IsLeapYear can be written like this:

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if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0){
     std::cout << year << " is a leap year\n";
}
else{
     std::cout << year << " is not a leap year" << std::endl;
}


You could also do with a parallel array that has the days in month. Or have a struct which holds the month name & days in month.

Michaela Elise is right - your menu selection is far to complicated, the same might be said for the rest of your code as well. 270 LOC is to much for this assignment - one could probably do it about 100 as a rough guess. Here is an outline of a menu:

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#include <ctype.h>  //for the toupper function

bool Quit = false;
char Option = 'D';

while(!Quit){
    ShowMenu();  //this function has cout's that display the menu options
    cin >> Option;
    Option = toupper(Option); //avoids testing vars twice

     switch (Option) {

          case 'D' :
                 //call this function
                 break;
         
          //other cases here

          case 'Q' : //user wants to quit
               Quit = true;  //this way execution continues after the while loop
               break;         //or call the exit function instead to end program

          default :
              std::cout << "Invalid Option Try again"
              break;

     }
}


You also need to make use of functions to get input once, so you don't have repetitive code.

EDIT: What you need is one function that calculates the number of days between 2 dates.

Hope all goes well 8+D
Last edited on
toomanystars (151)
I had a look at this earlier, and it's a bit of a mess. Try implementing TheIdeasMan's struct, for example:


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struct Date{

	int month,year,day;

};


Last edited on
chem major (16)
THANKS for all of the help, I'm actually VERY new to programming entirely. And I'm incredibly lost sometimes. I know it's a mess.

The structure of the menu looks great!

Could someone give me an idea about how to structure the functions though? (For all 3 options: days alive, days til birthday, days til 87). And how do I implement them in the code?

An example on how to calculate the days between two dates would be awesome!

@ toomanystars, what is struct? I'm guessing it's a type, but I haven't seen that before.



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