The #ifdef preprocessor directive checks if macro is defined by #define. If yes, it executes the code otherwise #else code is executed, if present.
Syntax with #else:
C #ifdef example
Let's see a simple example to use #ifdef preprocessor directive.
Value of a: 2
But, if you don't define NOINPUT, it will ask user to enter a number.
Enter a:5 Value of a: 5
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