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Home/ Questions/Q 8375895
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Editorial Team
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Editorial Team
Asked: June 9, 20262026-06-09T15:17:35+00:00 2026-06-09T15:17:35+00:00

int x = 0xff; printf(%#x,x); Output: 0xff printf(%x,x); Ouput: ff Why is there a

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int x = 0xff;
printf("%#x",x);

Output: 0xff

printf("%x",x);

Ouput: ff

Why is there a difference in output? What does # specifically do?

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  1. Editorial Team
    Editorial Team
    2026-06-09T15:17:37+00:00Added an answer on June 9, 2026 at 3:17 pm

    The standard says:

    7.21.6 – 2

    The result is converted to an ‘‘alternative form’’. … For x (or X)
    conversion, a nonzero result has 0x (or 0X) prefixed to it.

    It does other interesting stuff (especially for floats) but I have rarely seen it used – I honestly admit I had to look it up to remember.

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