Pointers¶

Q) Which of the following tells you where name is?¶

Given:
string name = "waldo";

a) cout << &name << endl;
b) cout << name << endl;
c) cout << *name << endl;
d) cout << &"waldo" << endl;

Q) Given the following code:¶

In [ ]:
int main() 
{
	int happiness = 0;

	// XXXXXXXXX

	*pFeeling = 100;
	cout << "Happiness is: " << happiness << endl;
}

Which of the following best replaces the line XXXXXXXX to allow this code to compile, run, and print out the happiness of 100?

a) int pFeeling = &happiness;
b) int *pFeeling = &happiness;
c) int &pFeeling = *happiness;
d) int *pFeeling = *happiness;

Q) Given the following code:¶

In [ ]:
int multiply(int *pOne, int *pTwo) 
{
	// XXXXXXXX
}

Which of the following best replaces line XXXXXXXX so the function multiplies the two values which the parameters point to?

a) return pOne * pTwo;
b) return &pOne * &pTwo;
c) return *pOne * *pTwo;
d) return *(pOne * pTwo);

Q) Which of the following is true about the size of pointer variables?¶

If a and b are defined as:

int *a = nullptr;
double *b = nullptr;

Which of the following is true?

a) sizeof(a) > sizeof(b); because a is declared before b.
b) sizeof(a) < sizeof(b); because doubles are bigger than ints.
c) sizeof(a) == sizeof(b); because both point to nullptr.
d) sizeof(a) == sizeof(b); because all pointers are the same size.

Answers¶

1 = a) cout << &name << endl;
2 = b) int *pFeeling = &happiness;
3 = c) return *pOne * *pTwo;
4 = d) sizeof(a) == sizeof(b); because all pointers are the same size.