Memory usage isn't decreasing when using free?

Question

Somehow this call to free() is not working. I ran this application on Windows and followed the memory using in Task Manager, but saw no reduction in memory usag

Answer 1

Note that the Task manager will show the memory "borrowed" by libc from the system. But not all mallocs will go through libc to the operating system and similarly not all free will free the system memory.

Usually, libc will allocate memory in larger chunks to supply for several malloc calls.