hi, i have found this

" 7 can be represented any one of the form 0X7, 0x7, 0x07, 0X07 "

i simply want to know does X and x have any difference ? what is that ?

i have never seen to use X.

now say, if i write 0X 1234 and 0x 1234 . are these two number different?

In any (real) language, 0x is used to indicate hex.

0x123 and 0X123 are the same.

I'm not sure if you can put a space before or after the x, though.

I've never seen anybody use 0X123, though, so you should stick with small x for looks.

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I'm not sure if you can put a space before or after the x
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you are right . i wrote that way bcoz trailing numbers are important. in fact spaces are not there.

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0x123 and 0X123 are the same
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-thanks for the information