Web Reference: Jan 10, 2025 · By specifically mentioning the NULL pointer, the C standard gives a mechanism using which a C programmer can check whether a given pointer is legitimate or not. Example 2: C Program to check successful memory allocation using malloc () The malloc () function returns the NULL pointer when the memory allocation is failed. We will use this property to check if the memory allocation is successful. In this tutorial we'll understand what null pointer is in C Programming and why we should use it. Checking if the FILE pointer returned by the fopen () function is NULL is always a recommended approach to avoid runtime errors in file-related processing. The following example shows how you can use the NULL file pointer to ensure that a file is accessible or not −.
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