ECE431 - Pointer & Reference

What does int* ptr = &num do?

• Declares an integer

• Stores the value of num

• Declares a pointer to num

• Assigns the value num to ptr

If x = 5 and int* px = &x;
what does *px return?

• 5

• Memory address of x

• Error

• Undefined value

What does the statement *mark = 40; do, if mark is a pointer to an integer?

• Stores 40 in a new location

• Changes the address mark is pointing to

• Changes the value at the pointed location to 40

• Causes a segmentation fault

What is the output of: int score = 88; int* pScore = &score; *pScore = 90; cout << score;

• 88

• 90

• Error

• Address of score

Which operator is used to declare a pointer?

• &

• *

• %

• ^

What is the purpose of &temp in int* p = &temp;?

• Declare a new pointer

• Get the value of temp

• Get the address of temp

• Initialize temp

Which line declares a reference / alias correctly?

• int ref = *val;

• int* ref = val;

• int& ref = val;

• int& ref = &val;

What is true about the following code? int age = 21; int& alias = age;

• alias and age refer to the same memory

• alias is a pointer

• alias stores address of age

• This will cause a compile error

Which of the following can be null (i.e., not pointing to anything)?

• Reference

• Pointer

• Alias

• Variable

What is the output? int x = 3; int& r = x; r = 9; cout << x;

• 3

• 9

• Address of r

• Compile error