#include <stdlib.h> char * itoa(int value, char *string, int radix)
This function converts its argument value into a null-terminated
character string using radix as the base of the number system. The
resulting string with a length of upto 33 bytes (including the optional
sign and the terminating NULL is put into the buffer whose address
is given by string. For radixes other than 10, value is
treated as an unsigned int (i.e., the sign bit is not interpreted as
such). The argument radix should specify the base, between 2 and
36, in which the string reprsentation of value is requested.
A pointer to string.
not ANSI, not POSIX
char binary_str[33]; (void)itoa(num, binary_str, 2);
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