[C programming]

I'm creating a function that returns a character given the parameters (radix, value). The second part of the function works. For example, if radix is 16 and value is 15, it returns 'F'; if radix is 16 and value is 10, it returns 'A'. However, when radix is 16 and value is anywhere between 0-9, the return output is ' ' (nothing--just single quotation marks with a space). It's suppose to return the value as a character. I'm not sure what I'm doing wrong. I'm trying to return values 0-9 as characters '0' through '9' but the return value is ' '.

This is what my terminal displays

MacBook-Pro:Desktop USER$ gcc -g -Wall numconv.c testConv.c -o testConv

MacBook-Pro:Desktop USER$ ./testConv i2c 16 9

int2char(16, 9) returns ' '

Function is below

char int2char (int radix, int value) {     if(value >= 0 && value         if(value