Format
#include <stdlib.h>
char *_ultoa(unsigned long value, char *string, int radix);
Language Level: Extension
Threadsafe: Yes.
Description
_ultoa converts the digits of the given unsigned long value to a character string that ends with a null character and stores the result in string. The radix argument specifies the base of value; it must be in the range 2 to 36.
Return Value
_ultoa returns a pointer to string. There is no error return value.
When the string argument is NULL or the radix is outside the range 2 to 36, errno will be set to EINVAL.
Example that uses _ultoa()
This example converts the integer value 255 to a decimal, binary, and hexadecimal representation.
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
char buffer[35];
char *p;
p = _ultoa(255UL, buffer, 10);
printf("The result of _ultoa(255) with radix of 10 is %s\n", p);
p = _ultoa(255UL, buffer, 2);
printf("The result of _ultoa(255) with radix of 2\n is %s\n", p);
p = _ultoa(255UL, buffer, 16);
printf("The result of _ultoa(255) with radix of 16 is %s\n", p);
return 0;
}
The output should be:
The result of _ultoa(255) with radix of 10 is 255
The result of _ultoa(255) with radix of 2
is 11111111
The result of _ultoa(255) with radix of 16 is ff
Related Information