Discussion
What will be the output of the following C code?
#include <stdio.h>
#define hello 10
void main()
{
printf("%d",hello);
#undef hello
printf("%d",hello);
}
Answer: C
Correct answer: error
The first printf is fine, but #undef hello removes the definition, so in the second printf the identifier hello is no longer replaced by 10. It is then an undeclared variable, and the compiler reports an error.
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