C Puzzle -Need Help..

Code:

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#include<stdio.h>

#define MAX(x,y) ( x ) > ( y ) ? x:y
main()
{ int i=10,j=5,k=0;
k= MAX(i++,++j);
printf("%d %d %d ",i,j,k);
}

Ans:12 6 11

but i'm expecting value of i to be 11 can some one explain how it is 12 in this expression?

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This is a classic case of macro expansion versus function call - since the macro expands the input parameter twice in the MAX() macro, it will increment one of the values twice.

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Mats

when compiling this line of code:

Code:

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k= MAX(i++,++j);

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the compiler substitutes MAX with the macro you defined:

Code:

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k= ( i++ ) > ( ++j ) ? i++ : ++j

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