DSA - Unit 1 Quiz

What is the & in pointers?

• Dereferences the memory address into an object

• References an object into a memory address

• Makes a new copy of the object as a memory address

• None of the above.

How do you make a pointer point to an existing variable?

int y = 0;

• 
  int *x = y;

• int &x = *y;

• int *x = &y;

• int x = y;

Which operator connects the structure name to its member name?

• -

• .

• <-

• both . and <-

Difference Between array and calloc()

• array: Size is fixed

  calloc () : fixed size

• 
  array: Size is fixed & static

  calloc () : fixed size & dynamic

• array: Size is fixed & dynamic

  calloc () : fixed size & dynamic

• 
  array: Size is fixed & static

  calloc () : fixed size can be altered & dynamic

How can we change the size of memory during run-time?

• malloc()

• calloc()

• realloc()

• free()

Dynamic memory allocation occurs

• when a new variable is created by the compiler

• when a new variable is created at runtime

• when a pointer fails to dereference the right variable

• when a pointer is assigned an incorrect address

What do the following declaration signify?

char *arr[10];

• arr is a array of characters.

• arr is a array of function pointer.

• arr is a array of 10 character pointers.

• arr is a pointer to array of characters.

In a C Program if

int a = 5;

Int *ptr = &a;

then the printf statement with

&a, a, *ptr , ptr represent

• adrress, Value, Value, Adress

• address, value, value, value

• all address

• all values

Number of bytes in memory taken by the below structure is?

struct test

{

int k;

char c;

};

• Multiple of integer size

• Depends on the platform

• Integer size+character size

• 
  Multiple of word size

What is the size of a C structure?

• C structure is always 128 bytes

• Size of C structure is the total bytes of all elements of structure

• Size of C structure is the size of largest element

• None of the mentioned