char* utoa(unsigned int val, char *s, int radix)
The function utoa() converts the unsigned integer value from
val into an ASCII representation that will be stored
under s. The caller is responsible for providing
sufficient storage in s.
The minimal size of the buffer
s depends on the choice of radix. For example, if
the radix is 2 (binary), you need to supply a buffer with a minimal length of 8 *
sizeof (unsigned int) + 1 characters, i.e. one character for each bit plus one for
the string terminator. Using a larger radix will require a smaller minimal buffer
size.
If the buffer is too small, you risk a buffer overflow.
radix as base, which may be a number between 2
(binary conversion) and up to 36. If radix is greater
than 10, the next digit after '9' will be the letter
'a'.The utoa() function returns the pointer passed as
s.