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Deallocating memory in both C and C++ involves freeing the memory that was previously allocated dynamically during runtime using functions like malloc, calloc, or new. However, there are some differences between deallocating memory in C and C++:

1. Deallocation syntax: In C, memory is deallocated using the free() function, while in C++, the delete operator is used.

2. Object destructors: C++ provides an additional mechanism for cleaning up resources when an object is deleted. When a C++ object is deleted, its destructor function is called to release any resources held by the object, including dynamically allocated memory. In C, there is no equivalent mechanism, and it is the programmer's responsibility to manually free all dynamically allocated memory.

3. Exceptions: C++ has an exception handling mechanism that can throw and catch exceptions during runtime. If an exception is thrown during memory deallocation, C++ will automatically call the appropriate destructors for any objects being deallocated before releasing the memory. In C, there is no exception handling mechanism, and memory deallocation errors must be handled manually.