____ is the third step in the computer machine cycle.?
A. ?Fetch
B. ?Decode
C. ?Execute
D. ?Store
Answer: C
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Consider the real-world transaction for dispensing cash discussed in Section 19.3.5. For each of the critical times—before, during, and after the execution of the real- world transaction—in which the system might crash, describe how the system (after it recovers from the crash) determines whether or not the cash has been dispensed. Discuss some ways in which the cash-dispensing mechanism itself might fail in such a way that the system cannot tell whether or not the cash has been dispensed.
What will be an ideal response?
The main difference between structures and classes is:
a. Whether they default to public or private access. b. How they access member variables. c. That classes always require new be used with them while structures do not. d. There is no difference between structures and classes.
What are the two possible ways to show your vector graphics on Web pages?
What will be an ideal response?
Consider a Rectangle class and a Square class that inherits from the Rectangle class:
a. Write post conditions for the Rectangle.setWidth(w:int) and the Rectangle.setHeight(h:int) operations in terms of the Rectangle.getWidth():int and the Rectangle.getHeight():int operations. b. Write an invariant for the Square class stating that the width and height of a Square should always be the same. c. Consider the rules for inheriting contracts described in Section 9.4.5 in the context of the Square.setWidth() and Square.setHeight() operations of the Square class. Are all rules met? Why not? What should change in the model?