Exam 1 Practice Questions

Definitions

1. Match the term on the left to the definition on the right (Programming Basics).

2. Match the term on the left to the definition on the right (Input/Output/Assignment).

3. Match the term on the left to the definition on the right (Data Types and Variables).

4. Match the term on the left to the definition on the right (Arithmetic and Type Conversion).

5. Match the term on the left to the definition on the right (<cmath> and <iomanip>).

6. Match the term on the left to the definition on the right (Selection).

Short Answer

7. Write the command to compile a program main.cpp.

8. What is the syntax for the entry point to a program that every C++ program must have?

9. What would happen if a C++ program did not include a main() function?

10. What do libraries do?

11. What is the purpose of the <iostream> library?

12. What is the purpose of the <cmath> library?

13. What is the purpose of the <iomanip> library?

14. For each of the following, mark if the identifier is valid or invalid. If the identifier is invalid say what character makes it invalid.

15. Name 5 different data types and what type of data can they hold.

16. What will the following snippet output:

    int a = 2, b = 5;
    double c = -5.5;
    cout << static_cast<int>(pow(b / a, a) + abs(c));

17. What will the following snippet output:

    double a = 8.63216;
    int b = 18, c = 4;
    cout << static_cast<int>(a + static_cast<double>(b) / c)`;

18. What will the following snippet output:

    double a = 10.0, b = 4.0;
    double c = a / b;
    cout << setprecision(2) << c << endl;

19. In the previous question, how can the cout statement be modified to make the setprecision() output the value showing 2 decimal places in fixed-point notation?

20. Explain the purpose of setw() and how the left and right operators effect it.

21. What is the difference between one-way, two-way, and n-way selection?

22. Explain what input failure is and why it might occur.

23. What data types might input failure occur on?

24. What boolean value can be checked to see if input failure occurred?

25. What data types can switch statement expressions be?

26. What happens if a break statement is left out of a case in a switch statement?

27. What is the order of operations including parenthesis, arithmetic operators, relational operators, logical operators, and the assignment operator? (Hint: there are 9 levels)

28. Determine if the following boolean expression results in a true or false result:

    int a = 20.0, b = 3.0;
    double c = 20.0, d = 3.0;
    a / b > 6 && c / d > 6

29. Using the following snippet of code:

    int a = 10, b = 5;
    cout << "Enter a value: ";
    cin >> a;
    if (a % b == 1) {
        cout << "If" << endl;
    }
    else if (a % b == 3) {
        cout << "Else if" << endl;
    }
    else {
        cout << "Else" << endl;
    }

    What prints if the user enters: (a) 11, (b) 23, and (c) 17?

Error Code

30. In the following program fix all the errors (write the fixes directly on the code)

    
    # include <iostream>
    
    using namespace std;
    
    int main()
    {
        int a = 5
    
        b = a + 10;
    
        cout << b << " + 10 = " << b << endl;
    
        return 0;
    }

31. In the following program fix all the errors (write the fixes directly on the code)

    
    # include <iostream>
    
    using namespace std;
    
    int main()
    {
        int bottles = 0;
    
        double ounces = 5.5;
    
        double total = bottles * ounces;
    
        cout >> "How many bottles do you have: ";
    
        cin
    
        cout >> bottles >> " bottles of "
             >> ounces >> "oz is "
             >> total >> "oz total\n";
    
        return 0;
    }

32. In the following program fix all the errors (write the fixes directly on the code)

    
    # include <iostream>
    
    using namespace std;
    
    int main()
    {
        double radius = 0.0;
    
        const double pi = 3.14159265359;
    
        cout << "Radius: ";
    
        cin >> radius;
    
        double area = pi * pow(radius, 2);
    
        cout << setprecision(2)
             << pi << " * "
             << radius << "^2 = "
             << area << endl;
    
        return 0;
    }

Programming Questions

33. Write a program that reads an integer length in inches, converts the read in length from integer inches to floating-point feet, then from floating-point feet to floating-point yards. Then, output the calculated values using the following output manipulation:

    • The label column (x -> y) should be left justified with a width of 20.
    • The second column (calculated value) should be right justified with a width of 10.
    • Output numbers should always have a precision of 3.

    Note: There are 12 inches in a foot, and 3 feet in a yard.

    Note: No error checking needs to be done.

    Example Program Interaction

    Inches: 275
    Inches -> Feet          22.917
    Feet -> Yards            7.639

34. Write a program that reads an integer length in centimeters, converts the read in length from integer centimeters to floating-point meters, then from floating-point meters to floating-point kilometers. Then, output the calculated values using the following output manipulation:

    • The label column (x -> y) should be left justified with a width of 25.
    • The second column (calculated value) should be right justified with a width of 15.
    • Output numbers should always have a precision of 1.
    • The fill of unused width spaces should be a -.

    Note: There are 100 centimeters in a meter, and 1000 meters in a kilometer.

    Note: No error checking needs to be done.

    Example Program Interaction

    Centimeters: 287541
    Centimeter -> Meter--------------2875.41
    Meter -> Kilometer------------------2.88

35. Write a program that reads a floating-point side length of a decagon, then error checks the value entered for input failure and that it is greater than 0. If input failure occurs or the input is less than 0, display an error and quit the program. If a valid value is read in the user should then select ’a’ or ’A’ to calculate the area or ’p’ or ’P’ to calculate the perimeter by the program reading in a character. A switch statement should then be used to calculate only the area or perimeter and output the respective result, or output an invalid selection message based on the character the user entered.

    Formulas:
    $perimeter=10s$
    $area=\frac{5}{2}a^2\sqrt{5+2\sqrt{5}}$

    Example Program Interactions

    Decagon Side Length: 6.8
    (A/a)rea -or- (P/p)erimeter: a
    Area: 355.78

    Decagon Side Length: 6.8
    (A/a)rea -or- (P/p)erimeter: P
    Perimeter: 68.00

    Decagon Side Length: 6.8
    (A/a)rea -or- (P/p)erimeter: e
    Invalid selection

36. Write a program that reads a floating-point side length of a hexagon, then error checks the value entered for input failure and that it is greater than 0. If input failure occurs or the input is less than 0, display an error and quit the program. If a valid value is read in the user should then select ’a’ or ’A’ to calculate the area or ’p’ or ’P’ to calculate the perimeter by the program reading in a character. A switch statement should then be used to calculate only the area or perimeter and output the respective result, or output an invalid selection message based on the character the user entered.

    Formulas:
    $perimeter=6s$
    $area=\frac{3\sqrt{3}}{2}a^2$

    Example Program Interaction

    Decagon Side Length: 7.2
    (A/a)rea -or- (P/p)erimeter: a
    Area: 134.68

    Decagon Side Length: 6.8
    (A/a)rea -or- (P/p)erimeter: P
    Perimeter: 43.20

    Decagon Side Length: 6.8
    (A/a)rea -or- (P/p)erimeter: e
    Invalid selection