Question

Consider the following function definition and variable declarations:

void square(int &n){n= n*n;}

int arr[] = {1, 2, 3};

int number = 4;

Which of the following function calls are acceptable? (can have multiple answer)

a.square(1);

b.square(2);

c.square(arr[number]);

d.square(number);

What is the output of the following code segment?

int arr[] = {1, 4, 1, 0};

for (int i=0; i < 4; ++i)

    cout<<arr[i]*2;

a.1014

b.1 4 1 0 (space in between each number)

c.1410

d.0140

e.None of the above

Given array declaration int a[] = {1, 2, 3};, the value of a[3] is

a.1

b.2

c.3

d.Undefined (or out-of-bound error)

e.None of the above

Answer 1

Question 1:

Answer :

c.square(arr[number]);

d.square(number);

Explanation :

• Here square(arr[number]); is acceptable but square(arr[4]) will be 0
• square(number); will be 16 because square(4) will be 16

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Question 2:

Answer :e.None of the above

Explanation :

• Here each element from the array will be multiplied by 2
• hence the output will be 2820

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Question 3:

Answer :e.None of the above

Explanation :Here a[3] will be 0 because array is defined with three elements and a[3] will be 0.

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