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CS 010: Introduction to Computer Science I

Quiz 7: 10 minutes

Use the following declaration statement for the next 4 questions.

vector<double> v(100);

1. How many elements does the vector v have?

a. 0

b. 1

c. 99

d. 100

e. 101

f. none of the above

2. What is the index number of the last element of the vector v?

a. 0

b. 1

c. 99

d. 100

e. 101

f. none of the above

3. What is the index number of the first element of the vector v?

a. 0

b. 1

c. 99

d. 100

e. 101

f. none of the above

4. Which of the following outputs the entire contents of the vector v?

a. cout << v;

b. for (int i = 0; i < 100; i++) cout << v[i] << “ “;

c. for (int i = 1; i <= 100; i++) cout << v[i] << “ “;

d. for (int i = 0; i < v.size(); i++) cout << v[i] << “ “;

e. for (int i = 1; i <= v.size(); i++) cout << v[i] << “ “;

f. B and D

5. The following declaration of the vector s is a legal C++ statement?

vector<string> s;

1. TRUE
2. FALSE

Use the following code fragment for the next 3 questions

(I recommend writing out the vector’s contents)

vector<int> v(2);

v[0] = 10;

v[1] = 20;

for (int i = 1; i < 3; i++)

{

v.push_back(i);

}

6. What is the value of v[2]?

1. 10
2. 20
3. 1
4. 2
5. 0
6. none of the above

7. What value will be returned by the function call v.size()?

1. 1
2. 2
3. 3
4. 4
5. 5
6. none of the above

8. What will be the value of the last element of v after the following statement is executed?

v.pop_back();

1. 10
2. 20
3. 1
4. 2
5. 3
6. none of the above

9. The last statement of the following code tries to assign a value outside the vector’s bounds (100 is not an index of the vector called points). This will cause a syntax error.

vector<Point> points(10);

points[100] = cwin.get_mouse(“Click anywhere”);

1. TRUE
2. FALSE

10. How many “*” will be output by the following code fragment?

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

{

for (int j = 0; j < m; j++)

{

cout << “*”;

}

}

1. 1
2. m
3. m + n
4. m * n
5. (m – 1) * (n – 1)
6. none of the above