Heap, stack memory allocation && constant area

1 Questions:

Determine which of the following statements is correct ()

1234	const char< /code> str1[] =  "abc" const char str2[] =  "abc" const char *p1 =  "abc" const char *p2 =  "abc"
Correct answer: A your answer: F (Error)str1 and STR2 address is different, P1 and P2 address the same str1 and STR2 address the same, P1 and P2 address the same str1 and STR2 address, P1 and P2 address different str1 and STR2 address is the same, P1 and P2 address different 4 addresses are the same 4 addresses are different

Parsing: str1 and str2: allocating memory in the stack, pointing to different addresses.

The position pointed to by the P1,P2 points to the constant area.

About stacks, heap memory allocations:

1 static allocations occur when a program is compiled and connected, and dynamic allocation occurs when a program call executes.

The 2 heap is dynamically allocated, with no statically allocated heap.

The 3 stack has two modes of allocation, static and dynamic. Static allocations are done by the compiler: allocations such as local variables.

4 dynamic allocations are allocated by the function malloc, however, the stack is dynamically allocated and the heap is different, and the stack is freed by the compiler without our manual implementation.

Stack memory allocation
—————
char*
Allocstrfromstack ()
{
Char pstr[100];
return pstr;
}
Pstr is released by the system when the function returns. So the returned char* had nothing.

Heap memory allocation
—————
char*
Allocstrfromheap (int len)
{
Char *pstr;

if (len <= 0) return NULL;
Return (char*) malloc (len);
}
PSTR is to allocate memory from the heap, so even if the program exits, it is not released, so the second function returned memory no problem, can be used, but must be released with free, or a memory leak occurs.

Heap, stack memory allocation && constant area