Trying to take input of int month from user and convert it to string month..What do you think is making it print default and not my input?

Please note that this is only part of my code. Also, I have created a class called DayOfYear

int main() { int Pass1; DayOfYear Day2; Day2.input(); cout< 
void DayOfYear::input() { int d, m, y; cout<<"Enter Month: "; cin>>d; cout<<"Enter Day: "; cin>>m; cout<<"Enter Year: "; cin>>y; }
 
string DayOfYear::monthHelper(int Num) { string mth; switch (Num) { case 1: mth = "January"; break; case 2: mth = "February"; break; case 3: mth = "March"; break; case 4: mth = "April"; break; case 5: mth = "May"; break; case 6: mth = "June"; break; case 7: mth = "July"; break; case 8: mth = "August"; break; case 9: mth = "September"; break; case 10: mth = "October"; break; case 11: mth = "November"; break; case 12: mth = "December"; break; } return mth; }