java - Iterate through a number starting at the end and adding every other digit -

i working on school assignment, looking guidance on doing wrong. part of larger program, trying work on loop before implement rest of program. basically, loop suppose iterate through number , add every other number, example:

if number entered 48625, return sum of 5+6+4. figured have combine loop if statement iterate through each nth number, worked out far:

class testloop{      public static void main (string args[]){          int num = 12345;         int sum = 0;          for(int = 0; num > 0; i++)         {             if(i%num == 0)             {                 sum += num % 10;             }              num /= 10;          system.out.println(sum);     }     }  } 

unfortunately, not working. returns 6,5,5,5,5. not adding nth values planned.

i tried following:

int num = 12345; int sum = 0;  while(num > 0) {     sum += num % 10;     num /= 10; } 

but did not work either, returned 15, sum of digits in variable num. know close solution, it's somewhere between 2 codes, can't seem right.

int num = 12345; int sum = 0; int pos = 0; while(num > 0) {     int digit = num % 10;    // make blatantly clear digit     if (pos % 2 == 0)       sum += digit;     num /= 10;     pos++; } 

you needed checking mechanism ensure you're skipping half digits. [you're trying add digits of number, not numbers. editor.]

this fix first solution:

if(i%2 /*not num*/ == 0)