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Macros

Posted on 2000-04-11
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Last Modified: 2010-04-15
why does the macro increment or decrement twice before it evalutes,when we pass a increment or decrement operator as a parameter?
eg:#define macro(a) (a)*(a)

in the main function
   macro(++a);
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Question by:Ramprasad_Inala
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rbr earned 0 total points
ID: 2703569
A macro is just the source replacement


macro (++a) produces the source

(++a)*(++a) so a will be inremented twice.


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by:rbr
ID: 2703578
And pls read
http://www.eskimo.com/~scs/C-faq/q3.2.html

This code is not well defined and can produce any result.
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by:rbr
ID: 2703587
An pls give a comment to your other question
http://www.experts-exchange.com/jsp/qShow.jsp?ta=cprog&qid=10326206 
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Expert Comment

by:ozo
ID: 2706292
You can't depend on a being incrementyed twice, because an object shall be modified at most once between sequence points.
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