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(b) +439
(d) 786
How many bytes are required for each of these representations? 13.
Using hexadecimal notation, write the packeddecimal coding for the following
numbers:
(a) 12915
(c) 872
(b) +9876
(d) 256
How many bytes are required for each of these representations?
14. List out the similarities and differences between 7bit and 8bit ASCII.
15. Using binary notation, write the ASCII7 and ASCII8 codes for the following
words:
(a) DRY
(c) DAMP
(b) WET
(d) TERM
How many bytes are required for each of these representations?
16.
Using hexadecimal notation, write the ASCII7 and ASCII8 codes for the
following words:
(a) PRINT
(c) RUB
(b) TYPE
(d) GIVE
How many bytes are required for each of these representations?
17. Explain the meaning of the term "collating sequence".
18.
A computer uses EBCDIC as its internal representation of characters. In which
order will this computer sort the following strings?
(a) ABC
(c) 245
(b) 123
(d) ADD
19.
A computer uses ASCII. In which order will this computer sort the following
strings?
(a) BED
(d) 128
(b) 512
(e) BAD
.
(c) ADD
20. Give the full form of the following abbreviations:
(a) BCD
(b) EBCDIC
(c) ASCII Chapter 5
Computer Arithmetic
In Chapter 4 you have seen that computers store numbers, letters, and other characters in
coded form that is related to the binary number system. In this chapter you will learn why
computers use binary numbers instead of decimal numbers and how the basic arithmetic
operations are performed inside the computer using binary numbers.
WHY BINARY?
You might have observed in Chapter 3 that the use of a smaller base often requires more
positions to represent a given value (recall the reason for using octal and hexadecimal
notations). For example, 9io = 10012. Here four positions are required instead of one to
represent the decimal number 9 in binary form. In spite of this fact, almost all computers
use binary numbers. Hence the obvious question that arises is 'Why do we go for binary
numbers instead of...
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This document was uploaded on 04/07/2014.
 Spring '14

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