The memory space reserved when calling malloc is on:The stackThe heapI don't know

Answering the Question

When you call malloc in C or C++, it reserves memory space from:

1. The Heap: The heap is a region of a process's memory that is used for dynamic memory allocation. Unlike stack memory, which is automatically managed, the heap allows applications to allocate and free memory as needed during runtime.

2. The Stack: This is a different area of memory that is used for static memory allocation, where variables are allocated and deallocated automatically as functions are called and return.

3. I don't know: This option reflects uncertainty regarding the answer.

Summary

In conclusion, when calling malloc, the memory space is allocated from the heap. The heap provides a large, flexible area for dynamic memory allocation, which is essential for many programming tasks.