What is the difference between #ifdef and #ifndef in C?
An example of an AI chatbot conversation about the difference between #ifdef and #ifndef in C programming.
What is the difference between #ifdef and #ifndef in C?
#ifdef checks if a macro is defined, while #ifndef checks if a macro is not defined.
Can you give me an example of how to use both?
Sure! Use #ifdef to include code only if a macro is defined, and #ifndef to include code if it's not defined.
Why would I use #ifndef instead of #ifdef?
You'd use #ifndef to prevent code from being included multiple times, which helps avoid redefinition errors.
Are there any best practices for using these directives?
Yes, always use #ifndef in header files to prevent multiple inclusions, and use #ifdef for conditional compilation.
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