java - Error: variable digitMonth might not have been initialized -

i'm trying write program takes birth year, month, , day , calculates day said birthday lies on. thing is, error message:

error: variable digitmonth might not have been initialized total = inputyear + test2 + digitmonth + inputday; ^

i don't know how fix it. setting digitmonth number (e.g. 1)makes program work, formula, each month requires different number (1 january, 4, february, 4 march, 0 april, etc)

i've looked @ other questions errors , haven't found useful yet.

help?

import java.util.scanner; public class birth{  public static void main(string[] args) {     scanner scan = new scanner(system.in);     int inputyear, inputmonth, inputday, digitmonth, test2, total, daynum;      system.out.println("enter last 2 digits of year born in");     inputyear = scan.nextint();     system.out.println("enter month number born in");     inputmonth = scan.nextint();     system.out.println("enter birth day");     inputday = scan.nextint();      test2 = inputyear / 4;      if (inputmonth > 0 && inputmonth < 2)     {         digitmonth = 1;     }     else if (inputmonth > 1 && inputmonth < 3)     {             digitmonth = 4;     }     else if (inputmonth > 2 && inputmonth < 4)     {             digitmonth = 4;     }     else if (inputmonth > 3 && inputmonth < 5)     {             digitmonth = 0;     }     else if (inputmonth > 4 && inputmonth < 6)     {             digitmonth = 2;     }     else if (inputmonth > 5 && inputmonth < 7)     {             digitmonth = 5;     }     else if (inputmonth > 6 && inputmonth < 8)     {             digitmonth = 0;     }     else if (inputmonth > 7 && inputmonth < 9)     {             digitmonth = 3;     }     else if (inputmonth > 8 && inputmonth < 10)     {             digitmonth = 6;     }     else if (inputmonth > 9 && inputmonth < 11)     {             digitmonth = 1;     }     else if (inputmonth > 10 && inputmonth < 12)     {             digitmonth = 4;     }     else if (inputmonth > 11 && inputmonth < 13)     {             digitmonth = 6;     }     else         system.out.println("you fuck-up");       total = inputyear + test2 + digitmonth + inputday;     daynum = total / 7;      if (daynum > 0 || daynum < 2)     {         system.out.println("you born on sunday");     }     else if (daynum > 1 || daynum < 3)     {         system.out.println("you born on monday");     }     else if (daynum > 2 || daynum < 4)     {         system.out.println("you born on tuesday");     }     else if (daynum > 3 || daynum < 5)     {         system.out.println("you born on wednesday");     }     else if (daynum > 4 || daynum < 6)     {         system.out.println("you born on thursday");     }     else if (daynum > 5 || daynum < 7)     {         system.out.println("you born on friday");     }     else if (daynum > -1 || daynum < 1)     {         system.out.println("you born on saturday");     } } 

}

you assign value digitmonth inside if , else if statements , not on final else statement.
happenes if none of if , else if succeeds , else part does?
value of digitmonth ?

answer: none

may never happen in code nevertheless compiler complains it.

there 2 solutions:

1) give initial value digitmonth. i.e. int digitmonth = 0;

2) initialize digitmonth inside final else. i.e:

else{     //some code     digitmonth = 0; } 

hope helps