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CS 010: Introduction to Computer Science I

Quiz 6: 10 minutes

1. How many asterisks will be output by the following code?

for (int i = m; i < n; i++)

{

cout << “*“;

}

a. 0

b. 1

c. n - 1

d. n - m

e. n + m

f. n - m + 1

2. How many asterisks will be output by the following code?

for (int i = 1; i <= m; i++)

{

for (int j = 1; j <= n; j++)

{

cout << “*“;

}

cout << endl;

}

a. 0

b. 1

c. m + n

d. m * n

e. (m - 1) + (n - 1)

f. (m + 1) * (n + 1)

3. How many rows of asterisks will be output by the code in question 2?

a. 0

b. 1

c. m

d. n

e. m - 1

f. m * n

4. What happens when you put a semicolon right after a while loop’s conditional expression as in the following example?

while (n <= 10);

{

cout << n << “ “;

n++;

}

a. If n is less than 10, this will be an infinite loop.

b. This is a syntax error.

c. This will output the integers from n to 10 if n is less or equal to 10.

d. Nothing happens. The while loop is skipped.

5. What happens when you put a semicolon right after a do while loop’s conditional expression as in the following example?

do

{

cout << n << “ “;

n++;

} while (n <= 10);

a. If n is less than 10, this will be an infinite loop.

b. This is a syntax error.

c. This will output the integers from n to 10 if n is less or equal to 10.

d. Nothing happens. The while loop is skipped.

6. What is output by the following code?

int n = 10;

do

{

cout << n << “ “;

n++;

} while (n < 5);

cout << n << endl;

1. 10
2. 10 11
3. 11
4. 10 10
5. 11 12
6. There is a syntax error.

7. Is it possible to say there is definitely a syntax error in the following code fragment without knowing anything else about the C++ program it came from other than that v is a vector?

v[0] = 10;

v[1] = s;

v[2] = “s“;

1. Yes, there is definitely a syntax error.
2. No, we need to know more about the program this code came from to say it is definitely a syntax error.

8. How many elements does the vector v have after the following declaration?

vector<int> v(n);

1. 0
2. 1
3. n
4. n - 1
5. n + 1
6. none of the above

9. What is the index number of the last element in vector v from question 8?

1. 0
2. 1
3. n
4. n - 1
5. n + 1
6. none of the above

10. Which statement(s) outputs the entire contents of vector v from question 8.

1. for (int i = 1; i <= n; i++) cout << v[i];
2. for (int i = 1; i <= v.size(); i++) cout << v[i];
3. cout << v;
4. cout << v[n];
5. for (int i = 0; i < v.size(); i++) cout << v[i];
6. A, C, and E all output the entire contents of vector v.