Int to Str Konvertierung

Müsste in jedem Programmierhandbuch für C zu finden sein: itoa()

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char* itoa (int __val, char * __s, int __radix)

Convert an integer to a string.
The function itoa() converts the integer value from val into an ASCII 
representation that will be stored under s. The caller is responsible 
for providing sufficient storage in s.

Note:
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 (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.

Warning:
If the buffer is too small, you risk a buffer overflow. Conversion is 
done using the 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 
itoa() function returns the pointer passed as s.