Discussion
What is the output of this program?
#include <stdio.h>
#include <stdlib.h>
#define square(x) x*x
int main()
{
int i;
i = 27/square(3);
printf("%d",i);
return 0;
}
Answer: D
Correct answer: 27
The macro has no parentheses, so 27/square(3) expands to
27/3*3
and with / and * at equal precedence and left associativity that is \((27/3) \times 3 = 9 \times 3 = 27\). The intended \(27/9 = 3\) needs #define square(x) ((x)*(x)).
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