Memory Fundamentals Quiz

Test understanding of heap memory and sbrk

1. What does sbrk(0) return?

The current program break (end of heap) NULL on all systems The start of the heap The amount of free memory

2. Why can't we simply use sbrk(-n) to return memory to the OS after every free()?

sbrk only works with positive values Memory in the middle of the heap cannot be returned The kernel ignores negative sbrk values It would be too slow

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