ultoa converts an unsigned long -- utoa converts an unsigned integer to a null-terminated string and stores it, without overflow checking.

#include <stdlib.h>

char *utoa(unsigned int value, char *string, int radix);
char *ultoa(unsigned long value, char *string, int radix);

#include <wchar.h>

wchar_t *_utow(unsigned int value, wchar_t *string, int radix);
wchar_t *_ultow(unsigned long value, wchar_t *string, int radix);

Parameters

value

Number to convert.

string

String result.

radix

Base of value; must be in the range 2-36.

Remarks

The string buffer must be large enough to accommodate the largest representation of a long integer that radix calls for. For example, on an RT system, the largest signed values represented in a 32-bit integer are -2,147,483,648 and +2,147,483,647. In base 2, their binary representations are 1 and thirty-one trailing 0s, and 0 and thirty-one trailing 1s, respectively. With the sign and terminating null character, the minimum buffer size would be thirty-four bytes for binary representation.

For portability, use sprintf 's %lo, %ld, or %lx conversion specifiers, if radix is 8, 10, or 16, when calling ultoa. Use sprintf's %o, %d, or %x conversion specifiers, if radix is 8, 10, or 16, when calling utoa.

With radix greater than 10, digits in the converted string representing values 10 through 35 are the characters a through z.

Return Values

A pointer to the string.

Success.

No error return.

Failure.

Generic Text Routines

Requirements