Chapter 6, Problem 7SA

Consider the following statements:

$\begin{array}{l}\text{int num1, num2, num3;}\hfill \\ \text{double length, width, height;}\hfill \\ \text{double volume;}\hfill \\ \text{num1 = 6; num2 = 7; num3 = 4;}\hfill \\ \text{length =6}\text{.2;width =2}\text{.3; height =3}\text{.4;}\hfill \\ \text{and the function prototype:}\hfill \\ \text{double box}\left(\text{double, double, double}\right)\text{;}\hfill \end{array}$

Which of the following statements are valid? If they are invalid, explain why. (4)

1. volume = box (length, width, height);

2. volume = box (length, 3.8, height);

3. cout << box(num1, num3, num2) << endl;

4. cout << box (length, width, 7.0)<< endl;

5. volume = box (length, num1, height);

6. cout <<box(6.2, height) << endl;

7. volume = box (length + width, height)

8. volume = box (num1, num2 + num3) ;