DMA and Stacks

Which function is used to delete the allocated memory space?

• Malloc()

• free()

• Calloc()

• None

#include <stdio.h>

void main() {

int ptr = (int )malloc(sizeof(int));

*ptr = 10;

free(ptr);

p = 5;

printf("%d", ptr);

}

• Compilation error

• 5

• 0
  

• Garbage value

What function should be used to free the memory allocated by calloc() ?

• dealloc();
  

• malloc(variable_name, 0)

• free();

• memalloc(variable_name, 0)

How to increase the size of dynamically allocated array?

• realloc(variable_name, value);

• malloc(variable_name, value);

• calloc(variable_name, value);

• I dont know

What is correct about calloc() function?

• Allocates the space for elements of an array.

• Initializes the elements to zero.

• If space is insufficient returns a NULL pointer.

• All of these

What is the functionality of realloc()?

• Change the location of memory allocated by malloc() or calloc().

• Reallocates memory deleted by free() function.

• It is used to modify the size of the previously allocated memory space.

• None of these

Process of inserting an element in stack is called ____________

• Create
  

• Push
  

• Evaluation
  

• Pop

In a stack, if a user tries to remove an element from an empty stack it is called _________

• Underflow

• Empty collection

• Overflow

• Garbage Collection

Pushing an element into stack already having five elements and stack size of 5, then stack becomes ___________

• Overflow

• Crash

• Underflow

• User flow

void main()
{
    int ptr;
    ptr = (int )calloc(1,sizeof(int));
    printf("%d\n",*ptr);
}

• 0

• -1

• Error

• Null