Thread: All possible combinations for any number of digits and characters

Hey, I have a lab assignment for school in which I have to write a recursive c or c++ function that will send every possible combination of a group of letters and any number of digits to a file.
For example: 5 Chars - 3 Digits would have to look like

Code:

A
B
C
D
E
AA
AB
AC
AD
AE
BA
BB
BC
BD
BE
CA
CB
CC
CD
CE
DA
DB
DC
DD
DE
EA
EB
EC
ED
EE
AAA
AAB
AAC
...
EEE

I've spent a long time thinking about it and don't know how I should do it, whether it be linked lists with recursion or objects oriented. Any thoughts would be great.