Question

Given the poem:

Thirty days hath September
April, June, and November
All the rest have thirty-one
with February's 28 to make it fun.
Leap Year happening one in four, Gives February one day more.

How would I write this program using an Enum instead of an array?

1. Prompts the user for a month string (January, February, ...). Validate the input month string against an array of month's, and prompt the user again if the String entered is not a valid month. Note: You may want to use an Enum.

2. Prompts the user for a year (e.g. 2016).

3. For months with 31 days, output the phrase "all the rest have thirty-one". For September, the phrase "Thirty days hath September". For April, June, and November the phrase "April, June, and November". For February, if the year is not a leap year, output the phrase "with February's 28 to make it fun.". If the use did supply a leap year (and the user supplied February as the month), output the phrase "Leap Year happening one in four, Gives February one day more."

Answer 1

#include <iostream>
#include <string>

typedef enum months {
    JANUARY = 1,
    FEBRUARY,
    MARCH,
    APRIL,
    MAY,
    JUNE,
    JULY,
    AUGUST,
    SEPTEMBER,
    OCTOBER,
    NOVEMBER,
    DECEMBER,
    INVALID
} Month;

Month getMonth(std::string input) {
    if (input.compare("January") == 0) {
        return JANUARY;
    } else if (input.compare("February") == 0) {
        return FEBRUARY;
    } else if (input.compare("March") == 0) {
        return MARCH;
    } else if (input.compare("April") == 0) {
        return APRIL;
    } else if (input.compare("May") == 0) {
        return MAY;
    } else if (input.compare("June") == 0) {
        return JUNE;
    } else if (input.compare("July") == 0) {
        return JULY;
    } else if (input.compare("August") == 0) {
        return AUGUST;
    } else if (input.compare("September") == 0) {
        return SEPTEMBER;
    } else if (input.compare("October") == 0) {
        return OCTOBER;
    } else if (input.compare("November") == 0) {
        return NOVEMBER;
    } else if (input.compare("December") == 0) {
        return DECEMBER;
    } else {
        return INVALID;
    }
}

bool isLeapYear(int year) {
    if (year %4 == 0) {
        return true;
    }
    return false;
}

int main () {
    std::string user_month = "";
    int user_year;
    Month month = INVALID;

    std::cout<<"Enter month: ";
    std::cin >> user_month;
    std::cout<<"Enter year: ";
    std::cin>>user_year;
    bool isLeap = isLeapYear(user_year);
    do { 
        month = getMonth(user_month);
    }while (month == INVALID);

    switch (month) {
        case JANUARY:{
                         std::cout<<"\nall the rest have thirty-one.\n";
                     } break;
        case FEBRUARY:{
                          if (isLeap) {
                            std::cout<<"\nwith February's 28 to make it fun.\n";
                          } else {
                            std::cout<<"\nLeap Year happening one in four, Gives February one day more.\n";
                          }
                      } break;
        case MARCH:{
                         std::cout<<"\nall the rest have thirty-one.\n";
                   } break;
        case APRIL:{
                         std::cout<<"\nApril, June, and November\n";
                   } break;
        case MAY:{
                         std::cout<<"\nall the rest have thirty-one.\n";
                 } break;
        case JUNE:{
                         std::cout<<"\nApril, June, and November\n";
                  } break;
        case JULY:{
                         std::cout<<"\nall the rest have thirty-one.\n";
                  } break;
        case AUGUST:{
                         std::cout<<"\nall the rest have thirty-one.\n";
                    } break;
        case SEPTEMBER:{
                         std::cout<<"\nThirty days hath September.\n";
                       } break;
        case OCTOBER:{
                         std::cout<<"\nall the rest have thirty-one.\n";
                     } break;
        case NOVEMBER:{
                         std::cout<<"\nApril, June, and November\n";
                      } break;
        case DECEMBER:{
                         std::cout<<"\nall the rest have thirty-one.\n";
                      } break;
        case INVALID: {
                          /* do nothing this is not possible */
                      } break;
    }

    return 0;
}

/* hope this helps if any queries please do comment*/