Web Reference: In C, there is no special method for comparing NULL values. We can use if statements to check whether a variable is null or not. NULL is a macro that represents a null pointer constant, typically defined as (void*)0. Jun 9, 2025 · It's best to check your pointers against NULL directly, and use 0 in other contexts. This keeps your code clean and easy to understand, since you'll know you're working with pointers every time you see NULL. For example, fopen() returns NULL if a file cannot be opened, and malloc() returns NULL if memory allocation fails. We can check for this using an if statement, and print an error message if something goes wrong.
YouTube Excerpt: Checking for null
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