ultoa(), ulltoa()

Convert an unsigned long integer into a string, using a given base

Synopsis:

#include <stdlib.h>

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

char* ulltoa( unsigned long long value
              char* buffer,
              int radix );

Arguments:

value
The value to convert into a string.
buffer
A buffer in which the function stores the string. The size of the buffer must be at least 33 bytes when converting values in base 2 (binary).
radix
The base to use when converting the number. This value must be in the range:
2 ≤ radix ≤ 36
  

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The ultoa() and ulltoa() functions convert the unsigned binary integer value into the equivalent string in base radix notation, storing the result in the character array pointed to by buffer. A NUL character is appended to the result.

Returns:

A pointer to the result.

Examples:

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

void print_value( unsigned long int value )
  {
    int base;
    char buffer[33];

    for( base = 2; base <= 16; base = base + 2 )
      printf( "%2d %s\n", base,
          ultoa( value, buffer, base ) );
  }

int main( void )
  {
    print_value( (unsigned) 12765L );
    return EXIT_SUCCESS;
  }

produces the output:

 2 11000111011101
 4 3013131
 6 135033
 8 30735
10 12765
12 7479
14 491b
16 31dd

Classification:

ultoa() is QNX 4; ulltoa() is Unix

Safety:  
Cancellation point No
Interrupt handler Yes
Signal handler Yes
Thread Yes

Last modified: 2013-12-23

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