why people use hexadecimal with printf statament in many languages including shell and c

Please provide three (or more) examples so that we could discuss your question.

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Printed "0x45"

Idk hex that's an assumed hex code

This command doesn't work for me:
Also it has nothing to do with 'printf'. So I couldn't decrement the counter, it is still 'three':
Please provide three (or more) examples so that we could discuss your question.

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Sorry printf

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@shlomo.hovir your question is so general, that without better examples, or further elaboration, the answer to your question is "because they want to".

EDIT: There was a long delay in posting this, and I wasn't aware that Hydrurga had replied yet.

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As said previously, it's hard to answer that question without any examples...
Out of the blue, I would list at least 2 potential reasons:

• make sure the shell doesn't interpret the character (echo -e "This is a \x22test\x22")
• represent keyboard missing characters easily ("0xAE" for registered trademark...)

shlomo.hovir, you have been asked for specific examples so that others can understand your question...

And again...
Simply saying...
... is not only not helpful, but may be taken as dismissive and taunting by other members.

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