C++ References

In C++ a variable that has an & appended is storing a(n):

• value

• address

• integer

• string

The "&" symbol is called a(n):

• sandpaper

• ampersand

• percentage sign

• andthisthat

I have a variable int a = 2;

then a variable int& b = a;

What happens if I change the value of b

• Nothing

• a changes as well

• b gets bigger

• a disappears

Which of these looks like a possible output

int variable = 5;

cout<<&variable;

• 5

• 0x7ffc8d64e404

• &5

• this would throw an error

If the address of b is at 0x7ff.

What would the following code output?

int b = 160;

int &a = b;

int &c = a;

cout<<a <<endl;

cout<<&c;

• 160

  160

• 0x7ff

  160

• 160

  0x7ff

• 0x7ff

  0x7ff

Given the function

int var(int& x){

x+= 10;

return 0;

};

What will this code output?

int main(){

int b = 160;

var(b);

cout<<b <<endl;

}

• 160 160

• 170

• b

• 22xff

Given the function

int var(int& a){

a*= 2;

return 0;

};

What will this code output?

int main(){

int b = 160;

int a = b - 60;

var(a);

cout <<b <<endl;

cout<< a <<endl;

}

• 160

  200

• 160

  320

• 320

  160

• 160

  80

Given the function

void fun(int& a, int& b){

int c = a;

a = b;

b = c;

};

What will this code output?

int main(){

int b = 160;

int a = b - 60;

fun(a, b);

cout <<b <<endl;

cout<< a <<endl;

}

• 100

  100

• 100

  160

• 160

  100

• 160

  160

How will the array be displayed after we call fun(arr[1], arr[3]?

void fun(int& a, int& b){

int c = a;

a = b;

b = c;

};

int main(){

int arr[] = { 10, 20, 30 40 }

fun(arr[1], arr[3]);

for(int i = 0; i < sizeof(arr); i ++){

cout<<arr[i] << " ";

}

}

• 10 40 30 20

• 20 30 40 10 20 30 40

• 40 20 30 10

• 30 40 10 20

Fill this blank to have the function work as instructed:

int practice(int& x){

//multiply x by 2

___________

return 0;

}

• x*=2

• x**

• x*2

• return 2*x