Hackharbor 3.0 Day 3:C

What does the * operator do when used with a pointer?

• Declares a pointer

• Returns the size of the memory block

• Dereferences the pointer to access the value

• Increments the pointer

What does the & operator do in C?

• Multiplication

• Access value at a memory address

• Get memory address of a variable

• Error

What must be done after dynamic memory is no longer needed?

• Nothing

• Use delete

• Use realloc()

• Use free()

What best describes the relationship between a pointer and the variable it points to?

• A loyal friend who never leaves

• An emotionally distant partner who only remembers the address

• A clingy ex who still knows where you live

• Just roommates

What is the correct way to declare a pointer to an integer?

• int ptr;

• int &ptr;

• int *ptr;

• pointer int ptr;

What exactly is a “pointer to a pointer”?

• A friend who tells you where another friend is

• A directory full of pizza recipes

• A function that can’t make up its mind

• A pointer that’s been left on read

What is the output of this code?

• 1

• 2

• Garbage value

• Address of p

What will the expression *(arr + i) return in an integer array?

• The address of arr[i]

• The value of arr[i]

• The size of the array

• An error

Why should you always free() memory after using malloc()?

• Because memory deserves closure

• Because your program is not your parent—it shouldn't clean up after you

• Because malloc() feels suffocated otherwise

• To impress the C compiler

In C, the name of an array acts as:

• Value of the first element

• Pointer to the last element

• Pointer to the first element

• Memory location of the entire array