Complete Modern C++ - Dynamic Memory Allocation - Part I (malloc Function)

The video tutorial explains memory management in C, focusing on stack, data section, and heap. It introduces dynamic memory allocation using functions like malloc, calloc, and realloc, and emphasizes the importance of freeing memory to prevent leaks. Examples demonstrate memory allocation, typecasting, and handling dangling pointers. The tutorial concludes with best practices for managing memory in C programs.

Which memory area in C is used for allocating memory at runtime?

• Heap

• Register

• Stack

• Data section

What is the main difference between malloc and calloc?

• calloc allocates memory for arrays, malloc does not

• malloc allocates memory for arrays, calloc does not

• malloc initializes memory to zero, calloc does not

• calloc initializes memory to zero, malloc does not

What must a programmer do after using malloc to allocate memory?

• Initialize the memory to zero

• Use realloc to increase memory size

• Free the memory when done

• Convert the pointer to a wide pointer

What is a dangling pointer?

• A pointer that is used to allocate memory

• A pointer that points to a valid memory address

• A pointer that has been freed and set to null

• A pointer that points to an invalid memory address

What happens if you try to free a null pointer in C?

• The pointer is converted to a wide pointer

• The program crashes

• Nothing happens

• The memory is freed

How can you allocate memory for an array using malloc?

• By using realloc

• By specifying the number of elements only

• By specifying the size of each element only

• By multiplying the number of elements by the size of each element

What is a memory leak?

• When memory is freed but not allocated

• When memory is allocated for arrays

• When memory is initialized to zero

• When memory is allocated but not freed