Question

Given a number, calculate how many years into the future it is, and what date. Assume no leap years.
For example:
Please enter a day of the year (0 to exit): 1
jan 1
Please enter a day of the year (0 to exit): 365
dec 31
Please enter a day of the year (0 to exit): 366
1 year
jan 1
Please enter a day of the year (0 to exit): 0
Thanks for playing!

My current code:

#include <iostream>
#include <string>

using namespace std;

int main() {
    const int MonthDays[]={31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 366};
    const string MonthName[] = {"jan", "feb", "mar", "apr", "may", "jun", "jul", "aug", "nov", "dec"};
    int day, year, index;
    while(1){
    cout<<"Please enter a day of the year (0 to exit): ";
    cin>>day;
    cout<<day;
    cout<<endl;
        if(day==0){
            break;
        }
  
    while(day>0){
        if(day>365){
            year=day/366;
            day=day%365;
            cout<<year<<" Year"<<endl;
        }
        day=day%365;
        if(day==0){
            cout<<"dec 31"<<endl;
        }
        if(day>=1&&day<=31){
            cout<<MonthName[index]<<" "<<day;
            cout<<endl;
        }
        else {
            cout<<MonthName[index]<<" "<<day-MonthDays[index-1];
            cout<<endl;
        }
        cout<<"Please enter a day of the year (0 to exit): ";
        cin>>day;
        cout<<day<<endl;
    }
    }
    cout<<"Thanks for playing!";
  
    return 0;
}

----------------------------------------

my error message:

==================== YOUR OUTPUT =====================                                                                                              

0001: Please~enter~a~day~of~the~year~(0~to~exit):~1                                                                                                 

0002: jan~1                                                                                                                                         

0003: Please~enter~a~day~of~the~year~(0~to~exit):~365                                                                                               

0004: dec~31                                                                                                                                        

0005: jan~0                                                                                                                                         

                                                                                                                                                    

                                                                                                                                                    

=================== MISMATCH FOUND ON LINE 0005: ===================                                                                                

ACTUAL  : jan~0                                                                                                                                     

EXPECTED: Please~enter~a~day~of~the~year~(0~to~exit):~31                                                                                            

======================================================                                                                                              

                                                                                                                                                    

Adjust your program and re-run to test.                                                                                                             

                                         

Answer 1

#include <iostream>
#include <string>

using namespace std;

int main() {
    const int MonthDays[]={31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    const string MonthName[] = {"jan", "feb", "mar", "apr", "may", "jun", "jul", "aug", "sep", "oct", "nov", "dec"};
    int day, year=0, index;
    while(1){
        cin>>day;
        cout<<endl;
        
        if(day==0){
                break;
        }

        index = 0;
        year = 0;
        while(day > 365) {
                day = day - 365;
                year++;
        }
        if(year != 0) {
                cout<<year<<" Year"<<endl;
        }
        
        index = 0;
        while(day > MonthDays[index]) {
                day = day - MonthDays[index];
                index++;
        }
        cout << MonthName[index] << " " << day << endl;
    }
    cout<<"Thanks for playing!";
  
    return 0;
}

your code did not even have the names of all months.. I have corrected everything and as you can see in screenshot it works well. Please upvote. Thanks!