You can give a name for this region as shown below:
And when you close, it will become as below:
Example-2: define
Example-3: endif
Example-4: undef
What happens if I change define to undef, see the following picture:
You can see the above picture that when we change message1 from define to undef it becomes inactive. So this means when we run this program it will skip that part of code.
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