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How do I convert from decimal to hexidecimal?

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Contributed by Anonymous Monk on Mar 08, 2001 at 23:40 UTC
Q&A  > numbers


Answer: How do I convert from decimal to hexidecimal?
contributed by tye

sprintf "%x", $num;
Answer: How do I convert from decimal to hexidecimal?
contributed by jmcnamara

Use the X, x and # format codes in printf and sprintf:

    $num = 15;

    printf("%X\n",     $num);   # F
    printf("%x\n",     $num);   # f
    printf("%02x\n",   $num);   # 0f
    printf("%#x\n",    $num);   # 0xf
    printf("0x%02x\n", $num);   # 0x0f
The last example is excessive but it forces formatting for zero:
    printf("%#x\n",    0);      # 0
    printf("0x%02x\n", 0);      # 0x00

Answer: How do I convert from decimal to hexidecimal?
contributed by line_noise

Alternatively, to get the hex in a variable:

$octet = 192; $out = pack "c", $octet; $hex = unpack "H2", $out;

Edited by davido: Added code tags.

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