c++ - Incorrect Output After Increment -

i'm trying test function shownumbers, nothing being printed out screen. tried print out value of array index make sure has been incremented, value resulted in zero. here input , output.

input: 444a4 output: 0

and here link header file: http://pastebin.com/pfey3hpq
, main function: http://pastebin.com/5wlwncy0

you're not initialising i in loop in counter::countnumbers method. have this:

for(unsigned int i;i<input.length();i++){ 

when should this:

for(unsigned int = 0;i<input.length();i++){