if ur looking for a function i will post it, it is also 1 interger from 0 to 9 i will do later a small program for larger integers:
#include<iostream.h>

char integer_to_char(int);//prototype
...

when u put 0 in variable a , x holds a+48 this is the simple formula
to do a large number like 1234...etc u have to devide the number and put it in an array then switch each array element to type...

man its easy u have to use ascii code i will show u how with a simple program ok i hope this could help you and pls send me a reply telling me if thats what ur looking for :this silly software works...

i have the same homework , hehehe thats silly what this guy did , well we learned everything no need to ask teh guys for help , just do a research if u cant , no need to pass ur course dude