char* ltoa(long val, char *s, int radix)
The function ltoa() converts the long 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 (long 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'.If radix is 10 and val is negative, a minus sign will be prepended.
The ltoa() function returns the pointer passed as
s.