Question 3. Data Representations in a Computer System

Question 1. Applications of Computer Systems

1. Imagine such a situation. You decided to go to the restaurant to have a nice meal. But your were disappointed by the service. At first, the meal you ordered was brought to you after 35 minutes of waiting. Secondly, the waiter garbled the order and gave you salad you did not want to eat. The last thing you did not like – the restaurant did not have a change, so you waited again while they tried to find it.

So how you can use the Internet in order to describe other people about your experience and warn them about restaurant’s service?

2. Your friend Guf wants to learn the Java language. He is just a student at school (10^th grade). He has two classes of Informatics every week where they study only Microsoft Word and Excel applications. So Guf is bored by these subjects. He is really interested in programming, he knows a little bit of HTML and Pascal. But his dream is to create the java game which other people will be able to download, install on their computers and play. So what will be your advice in this case?

3. IITU announced the competition among freshman students. It asks to create the promotion video which will describe students’ life at the university. The main limit is to create it in one day. So what kind of instruments you will need to make if fast and with high quality?

Question 2. Number Conversions

In this section, you will convert numbers among binary, decimal and hexadecimal representations.

a. Complete the following chart by converting the numbers given in one of the notations to the other two. Show calculations.

Binary	Decimal	Hexadecimal
		0xE9
		0x2B3

b. What is the minimum number of bits that can be used to represent the decimal number 148? (Hint: convert 148 to binary.)

c. What is the minimum number of bytes that can be used to represent the decimal number 148?

d. What is a purpose of using hexadecimal notation?

e. What is ASCII code?

Question 3. Data Representations in a Computer System

Computer systems are made up of electrical components that are either on, or off, representing 1’s and 0’s, also called binary numbers. All data, such as numbers, are converted into binary representations in the computer system. The Extended ASCII chart below shows characters and their binary representations. Use the chart below and a calculator to answer the following questions:

Figure 1 ASCII code

You can obtain the binary representation of a word by concatenating the ASCII values of each letter. For example, “SSD2” in binary representation is 01010011 01010011 01000100 00110010.

a. “Snow” in binary representation is _____.

b. “Mail” in binary representation is _____, which is equivalent to _____ in decimal representation.

c. 01011001 01100001 01101000 01101111 01101111 is the binary representation of the ASCII string _____.

d. 0x7374756479 is a hexadecimal representation of the ASCII string _____.

e. 1751216740 is the decimal representation of the ASCII string _____.

Your grade will be based upon the following:

Questions
1. Applications of Computer Systems (30%)
2. Number Conversions (40%)
3. Data Representations in a Computer System (30%)

Дата добавления: 2015-11-16