Month day to year day programme i.e 2nd march= 61

//This programme is tested on visual studio 2012//
#include <iostream>

using namespace std;

void main()

{

    int month,day,yday;
    cout<<"------------------------------------------------------------------------------\n";
cout<<"This programme will print the year day on entering a month and the day\n";
cout<<"------------------------------------------------------------------------------\n";
do
{

    cout<<"Enter month"<<endl;

    cin>>month;
}
while(month<=0);
do
  {
 
    cout<<"Enter day"<<endl;

    cin>>day;
}
while(day<=0||day>31);
    if (month==1)

    {

     yday=day;

     cout<<"number of year days = "<<yday;

    }

     if (month==2)

{

     yday=31+day;

     cout<<"number of year days = "<<yday;

    }

     if (month==3)

{

     yday=59+day;

     cout<<"number of year days = "<<yday;

    }

     if (month==4)

{

     yday=90+day;

     cout<<"number of year days = "<<yday;

    }

     if (month==5)

{

     yday=120+day;

     cout<<"number of year days = "<<yday;

    }

     if (month==6)

{

     yday=150+day;

     cout<<"number of year days = "<<yday;

    }

     if (month==7)

{

     yday=181+day;

     cout<<"number of year days = "<<yday;

    }

     if (month==8)

{

     yday=212+day;

     cout<<"number of year days = "<<yday;

    }

     if (month==9)

{

     yday=243+day;

     cout<<"number of year days = "<<yday;

    }

     if (month==10)

{

     yday=273+day;

     cout<<"number of year days = "<<yday;

    }

     if (month==11)

{

     yday=313+day;

     cout<<"number of year days = "<<yday;

    }

     if (month==12)

     {

         yday=343+day;

     }
   cout<<"\n\n------------------------------------------------------------------------------\n";
    cout<<"Thank You for using.\n\nVisit http://bilalzahid22.blogspot.com/ for more\n";
  cout<<"\n------------------------------------------------------------------------------\n";
    }