eshivaprasad

hi all...
i came across one sentence...
can anyone tell me what it means?
#define set(x,y) (x|=x##_##y)
what does that symbol "##_##" means in the code...




with regards
shiva

RockyMarrone

it will concatenate the input values dear

Dino

Look in your C book for preprocessor directives, under substituting macro variables.

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rpbear

it means if
#define a(x) 1##x
and you ues printf to do this:
printf("%d",a(34));
it'll prodecu 134

King Mir

It's use to concatenate the parameters passed as identifiers. The preprocessor operator here is ##. set(var,feild1) would evaluate to (var|=var_feild1) for example.

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