1. income, two_fold and c3po are valid identifiers

2. A variable declaration statement reserves storage space in the computer's memory.

3. cout << "Please enter an integer";
   cin >> val1;
   cout << endl << "You have entered " << val1 << endl;
   cout << "Please enter a floating-point number";
   cin >> val2;
   cout << endl << " The second number you entered is " << val2 << endl;

4. 2.1, 2.1, 10.0, 7.2, 0.4, 0

5. 28, 4, 8, -8, 6, -19

6. a. (a * sqrt(c) + d)/(e * (u - v))
   b. fabs(a) + c * sqrt(u * v * w)

7. The following steps are not an algorithm because they never end.

   Shampooing
    (a) Rinse
    (b) Lather
    (c) Rinse
    (d) If hair clean, quit, otherwise go back to b

8. one

9. char ZED = 'Z';

10. char letter;
    string street;

11. street = "Elm";

12. The answer is AbrahamLincoln

13. F

14. A rolling
    stone

    gathers



    nomoss

15. F

16. const float PI = 3.14159;

17. int count;
    float sum;

18. a. someFloat = float(5 + someInt);
    b. someInt = int(2.5 * float(someInt)/someFloat);

19. someInt + 1

20. value-returning

21. cout << fixed << setw(9) << setprecision(2) << pay;