Memory Allocations in C (Static Memory Allocation)

What are the two types of memory allocations possible in C?

• (a) Static memory allocation (Compile-time allocation using arrays) (b) Dynamic memory allocation (Run-time allocation using pointers)

• (a) Manual memory allocation (User-defined allocation) (b) Automatic memory allocation (System-defined allocation)

• (a) Temporary memory allocation (Short-term allocation) (b) Permanent memory allocation (Long-term allocation)

• (a) Sequential memory allocation (Ordered allocation) (b) Random memory allocation (Unordered allocation)

In static memory allocation, when is the required amount of memory allocated to the program elements?

• At the start of the program

• At the end of the program

• During program execution

• After program termination

If you declare an array of five elements in C and try to read ten elements from it, what will happen?

• The program will give an error

• Only the first five values will be accessible

• The extra elements will be accessible

• The program will crash

What is one problem with static memory allocation in C?

• If you store less number of elements than the number of elements for which you have declared memory, then the rest of the memory will be wasted.

• It allows dynamic resizing of arrays at runtime.

• It automatically frees unused memory blocks.

• It prevents memory fragmentation completely.

In static memory allocation, the memory allocated to a variable is fixed and determined by the compiler at compile time.

• True

• False

What is the main advantage of dynamic or run-time memory allocation in programming?

• It allows memory to be allocated statically

• It allows memory to be allocated as needed at run-time

• It reduces the flexibility for programmers

• It is only used for static arrays

Which function is used in C to allocate a block of memory in bytes at run-time?

• calloc()

• malloc()

• free()

• realloc()

Fill in the blank: The syntax for using malloc to allocate memory is _________.

• malloc (number of elements * size of each element);

• malloc[number of elements * size of each element];

• malloc{number of elements * size of each element};

• malloc;

The malloc() function returns a pointer to the first block of allocated memory, and if it fails, it returns NULL.

• True

• False

In the statement 'int *ptr; ptr = (int *) malloc (10 * sizeof(int));', how many bytes of memory are allocated?

• 20 bytes

• 10 bytes

• 40 bytes

• 4 bytes