Bing Xi Computer Technology and Society 270378-2349 Assignment 9

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08.71.16 Bing Xi

Computer Technology and Society 270378-2349

Assignment 9

  1. Chapter 6, page 320, 1. What does it mean to say that a programming language is a machine independent?

It means that the language does not refer to the attributes of any particular machine, and it can be used on any machine by simply applying a appropriate compiler.

  1. Chapter 6 on page 320, 7. Suppose the function f expects two numeric values as its inputs and returns the smaller of the two values as its output value. If w, x, y, and z represent numeric values, what is the result returned by f(f(w,x), f(y,z)?

It returns the smallest value of w, x, y, and z.

  1. Draw the parse tree for the expression x - y * z + y * x based on the syntax diagrams in Figure 6.16 on page 299.

4. Download Python 2.5 and read the introduction to the IDLE programming environment that comes with Python 2.5.

1) Enter the following Python program (note that spaces at the beginning of the line make a difference in Python):

temp = input("What is the temperature?")

if temp < 5:

print "It is rather cold."


print "This is fine."

I entered the code in a new IDLE window and saved it, then I clicked “Run” => “Run Module”. In the main IDLE window a line of text “What is the temperature?” popped out, I input 5 and entered, another line popped up – “This is fine.”. I ran the module again but this time I input “3” and I got a response – “It is rather cold.”.

2) Change the program such that it checks if the temperature is higher than 30 and if so then prints out appropriate message.

temp = input("What is the temperature? ")

if temp < 5:

print "It is rather cold."

elif temp > 30:

print "It is ridiculously hot."


print "This is fine."

  1. Chapter 6, 325, social issue 4. To what extent is a programmer who helps develop a violent computer game responsible for any consequences of that game? Should children’s access to computer games be restricted? If so, how and by whom? What about other groups in society, such as convicted criminals?

A programmer bears responsibilities for the consequences of the game if it is violent. Although a programmer is not necessarily a designer; however, he can always reduce the harm (directly mental. indirectly physical, since the player might do in real life what he does in the game) that can be caused by the game during the implementation. Nevertheless, not to a great extend, since the programmer is simply the implementer, not the designer, who is much more responsible for the consequences.

Children’s access to benign computer games is reasonable, but their access to malign or violent games should be strictly restricted. Because children tend to learn what they see around them, they might very much try to do the things they do in the games. The restrictions should not only come from schools, parents, but also from the government or the legislature. Only by establishing rules or even laws the restrictions can truly be regarded.

Whether criminals’ access to violent games should also be restricted is hard to determine. On the one hand, allowing them to have access to violent game might give them a platform as an outlet of their criminal desires. On the other hand, those game might also bring them more desires of committing more crimes in real life.

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