_ultoa - Convert Unsigned Long Integer to String

Syntax

#include <stdlib.h>
char *_ultoa(unsigned long value, char *string, int radix);

ultoa converts the digits of the given unsigned long value to a null-terminated character string and stores the result in string. No overflow checking is performed. The radix argument specifies the base of value; it must be in the range of 2 through 36.
The space allocated for string must be large enough to hold the returned string. The function can return up to 33 bytes, including the null character (\0).

ultoa returns a pointer to string. There is no error return value.

This example converts the digits of the value 255 to decimal, binary, and hexadecimal representations.

#include <stdio.h>
#include <stdlib.h>

int main(void)
{
   char buffer[10];
   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 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
   ****************************************************************************/
}

[Back: _uheap_walk - Return Information about Memory Heap]

[Next: _umalloc - Reserve Memory Blocks from User Heap]