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CS 010: Introduction to Computer Science I

Quiz 6: 10 minutes

1. The following for loop and while loop will have the exact same output.

int i = 100; while (i > 0) { cout << i * i << “ “; i--; } cout << endl;

for (int i = 100; i > 0; i--) { cout << i * i << “ “; } cout << endl;

a. TRUE

b. FALSE

2. The following for loop and while loop will have the exact same output.

int i = 100; while (i > 0) { i--; cout << i * i << “ “; } cout << endl;

for (int i = 100; i > 0; i--) { cout << i * i << “ “; } cout << endl;

a. TRUE

b. FALSE

3. What is output by the following code?

int main()

{

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

{

cout << i << “ “;

}

cout << i << endl;

return 0;

}

a. 0 1 2 3 4

b. 0 1 2 3 4 5

c. 1 2 3 4 5

d. 4

e. 5

f. one of the cout statements has a syntax error because of the scope of i

4. What is output by the following code?

int main()

{

int i;

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

{

cout << i << “ “;

}

cout << i << endl;

return 0;

}

a. 0 1 2 3 4

b. 0 1 2 3 4 5

c. 1 2 3 4 5

d. 4

e. 5

f. one of the cout statements has a syntax error because of the scope of i

5. What is output by the following code?

int x = 10;

do

{

x -= 3;

cout << x << “ “;

} while (x > 0) ; // do while x is greater than 0

cout << x << endl;

1. 10 7 4 1 -2
2. 7 4 1 -2 -2
3. 7 4 1 1
4. 10 7 4 1
5. none of the above

6. What is output by the following code?

int x = 10;

do

{

x -= 3;

cout << x << “ “;

} while (x > 10) ; // do while x is greater than 10

cout << x << endl;

1. 10
2. 7 7
3. 7 4
4. 10 7
5. none of the above

7. Out of the following function headers, which is the BEST choice for a function that just reads in 2 integers from the user and “passes” them back to where the function was invoked (called)?

1. void get_inputs(int& input1, int& input2)
2. void get_inputs(int input1, int input2)
3. int get_inputs(int input1, int input2)
4. int get_inputs(int& input1, int& input2)
5. int get_inputs()
6. void get_inputs()

8. A do while loop guarantees that the body of the loop will execute at least once.

1. TRUE
2. FALSE

Use the following code for the next 2 questions

void f1(int& x)

{

x = 100;

}

void f2(int a, int& b)

{

a = a * b;

b = 12;

if (b < a)

{

f1(b);

}

else

{

f1(a);

}

}

int main()

{

int num1 = 2;

int num2 = 4;

f2(num1, num2);

cout << num1 << “ “ << num2 << endl; //OUTPUT 1

num1 = 4;

num2 = 5;

f2(num1, num2);

cout << num1 << “ “ << num2 << endl; //OUTPUT 2

return 0;

}

9. What will OUTPUT 1 print?
1. 2 4
2. 100 4
3. 8 12
4. 100 12
5. 2 12
6. none of the above

10. What will OUTPUT 2 print?

1. 20 5
2. 20 100
3. 4 100
4. 4 5
5. 20 12
6. none of the above