This document discusses different number systems including binary, decimal, octal, and hexadecimal. It provides examples of converting numbers between these number systems. The key points are:
1. There are four main number systems - binary uses 0 and 1, decimal uses 0-9, octal uses 0-7, and hexadecimal uses 0-9 and A-F.
2. Numbers can be represented differently in different systems but have the same value.
3. Conversion between number systems involves expressing the value of each digit based on its place value in that system.
4. Examples are provided of converting decimal, binary, octal and hexadecimal numbers to other number systems through determining place values of each digit.
Every computer stores numbers, letters and other specially characters In coded form. There are two types of number system-
Non-Positional Number system
Positional Number System
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Number System
Decimal Number System
Binary Number System
Why Binary?
Octal Number System
Hexadecimal Number System
Relationship between Hexadecimal, Octal, Decimal, and Binary
Number Conversions
Numbering system, binary number system, octal number system, decimal number system, hexadecimal number system.
Code conversion, Conversion from one number system to another, floating point numbers
A power point presentation on number system which briefly explains the conversion of decimal to binary, binary to decimal, binary to octal, octal to decimal. Ping me at Twitter (https://twitter.com/rishabh_kanth), to Download this Presentation.
A numeral system (or system of numeration) is a writing system for expressing numbers; that is, a mathematical notation for representing numbers of a given set, using digits or other symbols in a consistent manner. It can be seen as the context that allows the symbols "11" to be interpreted as the binary symbol for three, the decimal symbol for eleven, or a symbol for other numbers in different bases.
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Career Aptitude Test (IT Companies) and etc.
Every computer stores numbers, letters and other specially characters In coded form. There are two types of number system-
Non-Positional Number system
Positional Number System
To Download this click on the link below:-
http://www29.zippyshare.com/v/42478054/file.html
Number System
Decimal Number System
Binary Number System
Why Binary?
Octal Number System
Hexadecimal Number System
Relationship between Hexadecimal, Octal, Decimal, and Binary
Number Conversions
Numbering system, binary number system, octal number system, decimal number system, hexadecimal number system.
Code conversion, Conversion from one number system to another, floating point numbers
A power point presentation on number system which briefly explains the conversion of decimal to binary, binary to decimal, binary to octal, octal to decimal. Ping me at Twitter (https://twitter.com/rishabh_kanth), to Download this Presentation.
A numeral system (or system of numeration) is a writing system for expressing numbers; that is, a mathematical notation for representing numbers of a given set, using digits or other symbols in a consistent manner. It can be seen as the context that allows the symbols "11" to be interpreted as the binary symbol for three, the decimal symbol for eleven, or a symbol for other numbers in different bases.
quantitative aptitude, maths
applicable to
Common Aptitude Test (CAT)
Bank Competitive Exam
UPSC Competitive Exams
SSC Competitive Exams
Defence Competitive Exams
L.I.C/ G. I.C Competitive Exams
Railway Competitive Exam
University Grants Commission (UGC)
Career Aptitude Test (IT Companies) and etc.
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2. 2.2
2-1 INTRODUCTION2-1 INTRODUCTION
AA number systemnumber system defines how a number can bedefines how a number can be
represented using distinct symbols. A number can berepresented using distinct symbols. A number can be
represented differently in different systems. For example,represented differently in different systems. For example,
the two numbers (2A)the two numbers (2A)1616 and (52)and (52)88 both refer to the sameboth refer to the same
quantity, (42)quantity, (42)1010, but their representations are different., but their representations are different.
.There are 4 types of number system.There are 4 types of number system
Binary number system(11100)Binary number system(11100)22
Decimal Number system(783)10Decimal Number system(783)10
Octal Number system(67)8Octal Number system(67)8
Hexa Decimal Number system(ABCD)16Hexa Decimal Number system(ABCD)16
3. 2.3
1- Binary Number system: Binary Number system are those number system, which having
base 2. it means it can contain only two numbers that is 0
and 1 for example (0101010)2.
2- octal number system: The octal number systems are those number system, which having
base 8. it means I can contain 8 number (0,1,2,3,4,5,6,7) for example
(765)8.
3- Decimal Number system: The Decimal number systems are those number system, which having
base 10. it means It can contain 8 number (0,1,2,3,4,5,6,7,8,9) for
example (7659)10.
4- Hexa Decimal number system: The octal number systems are those number system, which
having base 16. it means It can contain 8 number
(0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F) for example (765DE)16.
Types of Number systemTypes of Number system
4. 2.4
S = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
The decimal system (base 10)
The word decimal is derived from the Latin root decem
(ten). In this system the base b = 10 and we use ten symbols
The symbols in this system are often referred to as decimal
digits or just digits.
5. 2.5
Example 2.1
The following shows the place values for the integer +224 in theThe following shows the place values for the integer +224 in the
decimal system.decimal system.
Note that the digit 2 in position 1 has the value 20, but the sameNote that the digit 2 in position 1 has the value 20, but the same
digit in position 2 has the value 200. Also note that we normallydigit in position 2 has the value 200. Also note that we normally
drop the plus sign, but it is implicit.drop the plus sign, but it is implicit.
6. 2.6
Example 2.2
The following shows the place values for the decimal numberThe following shows the place values for the decimal number
−7508. We have used 1, 10, 100, and 1000 instead of powers of−7508. We have used 1, 10, 100, and 1000 instead of powers of
10.10.
Note that the digit 2 in position 1 has the value 20, but the sameNote that the digit 2 in position 1 has the value 20, but the same
digit in position 2 has the value 200. Also note that we normallydigit in position 2 has the value 200. Also note that we normally
drop the plus sign, but it is implicit.drop the plus sign, but it is implicit.
( ) Values
7. 2.7
Reals
Example 2.3
The following shows the place values for the real number +24.13.The following shows the place values for the real number +24.13.
8. 2.8
The word binary is derived from the Latin root bini (or two
by two). In this system the base b = 2 and we use only two
symbols,
The binary system (base 2)
S = {0, 1}
The symbols in this system are often referred to as binary
digits or bits (binary digit).
9. 2.9
Example 2.4
The following shows that the number (11001)The following shows that the number (11001)22 in binary is thein binary is the
same as 25 in decimal. The subscript 2 shows that the base is 2.same as 25 in decimal. The subscript 2 shows that the base is 2.
The equivalent decimal number is N = 16 + 8 + 0 + 0 + 1 = 25.The equivalent decimal number is N = 16 + 8 + 0 + 0 + 1 = 25.
10. 2.10
Reals
Example 2.5
The following shows that the number (101.11)The following shows that the number (101.11)22 in binary is equalin binary is equal
to the number 5.75 in decimal.to the number 5.75 in decimal.
11. 2.11
The word hexadecimal is derived from the Greek root hex
(six) and the Latin root decem (ten). In this system the base
b = 16 and we use sixteen symbols to represent a number.
The set of symbols is
The hexadecimal system (base 16)
S = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F}
Note that the symbols A, B, C, D, E, F are equivalent to 10,
11, 12, 13, 14, and 15 respectively. The symbols in this
system are often referred to as hexadecimal digits.
12. 2.12
Example 2.6
The following shows that the number (2AE)16 in hexadecimal isThe following shows that the number (2AE)16 in hexadecimal is
equivalent to 686 in decimal.equivalent to 686 in decimal.
The equivalent decimal number is N = 512 + 160 + 14 = 686.The equivalent decimal number is N = 512 + 160 + 14 = 686.
13. 2.13
The word octal is derived from the Latin root octo (eight). In
this system the base b = 8 and we use eight symbols to
represent a number. The set of symbols is
The octal system (base 8)
S = {0, 1, 2, 3, 4, 5, 6, 7}
14. 2.14
Example 2.7
The following shows that the number (1256)The following shows that the number (1256)88 in octal is the samein octal is the same
as 686 in decimal.as 686 in decimal.
Note that the decimal number is N = 512 + 128 + 40 + 6 = 686.Note that the decimal number is N = 512 + 128 + 40 + 6 = 686.
15. 2.15
Table 2.1 shows a summary of the four positional number
systems discussed in this chapter.
Summary of the four positional systems
16. 2.16
Table 2.2 shows how the number 0 to 15 is represented in
different systems.
17. 2.17
We need to know how to convert a number in one system to
the equivalent number in another system. Since the decimal
system is more familiar than the other systems, we first show
how to covert from any base to decimal. Then we show how
to convert from decimal to any base. Finally, we show how
we can easily convert from binary to hexadecimal or octal
and vice versa.
Conversion
18. 2.18
Any base to decimal conversion
Figure 2.5 Converting other bases to decimal
19. 2.19
Example 2.8
The following shows how to convert the binary number (110.11)The following shows how to convert the binary number (110.11)22
to decimal: (110.11)to decimal: (110.11)22 = 6.75.= 6.75.
20. 2.20
Example 2.9
The following shows how to convert the hexadecimal numberThe following shows how to convert the hexadecimal number
(1A.23)(1A.23)1616 to decimal.to decimal.
Note that the result in the decimal notation is not exact, becauseNote that the result in the decimal notation is not exact, because
3 × 163 × 16−2−2
= 0.01171875. We have rounded this value to three= 0.01171875. We have rounded this value to three
digits (0.012).digits (0.012).
21. 2.21
Example 2.10
The following shows how to convert (23.17)The following shows how to convert (23.17)88 to decimal.to decimal.
This means that (23.17)8 ≈ 19.234 in decimal. Again, we haveThis means that (23.17)8 ≈ 19.234 in decimal. Again, we have
rounded up 7 × 8rounded up 7 × 8−2−2
= 0.109375.= 0.109375.
22. 2.22
Example 2.17
An alternative method for converting a small decimal integerAn alternative method for converting a small decimal integer
(usually less than 256) to binary is to break the number as the(usually less than 256) to binary is to break the number as the
sum of numbers that are equivalent to the binary place valuessum of numbers that are equivalent to the binary place values
shown:shown:
23. 2.23
Example 2.18
A similar method can be used to convert a decimal fraction toA similar method can be used to convert a decimal fraction to
binary when the denominator is a power of two:binary when the denominator is a power of two:
The answer is then (0.011011)The answer is then (0.011011)22
24. 2.24
Example 2.19
Show the hexadecimal equivalent of the binary numberShow the hexadecimal equivalent of the binary number
(110011100010)(110011100010)22..
SolutionSolution
We first arrange the binary number in 4-bit patterns:We first arrange the binary number in 4-bit patterns:
100 1110 0010100 1110 0010
Note that the leftmost pattern can have one to four bits. We thenNote that the leftmost pattern can have one to four bits. We then
use the equivalent of each pattern shown in Table 2.2 on page 25use the equivalent of each pattern shown in Table 2.2 on page 25
to change the number to hexadecimal: (4E2)16.to change the number to hexadecimal: (4E2)16.
25. 2.25
Example 2.20
What is the binary equivalent of (24C)What is the binary equivalent of (24C)1616??
SolutionSolution
Each hexadecimal digit is converted to 4-bit patterns:Each hexadecimal digit is converted to 4-bit patterns:
2 → 0010, 4 → 0100, and C →2 → 0010, 4 → 0100, and C →
11001100
The result is (001001001100)The result is (001001001100)22..
26. 2.26
Example 2.21
Show the octal equivalent of the binary number (101110010)Show the octal equivalent of the binary number (101110010)22..
SolutionSolution
Each group of three bits is translated into one octal digit. TheEach group of three bits is translated into one octal digit. The
equivalent of each 3-bit group is shown in Table 2.2 on page 25.equivalent of each 3-bit group is shown in Table 2.2 on page 25.
The result is (562)The result is (562)88..
101 110 010101 110 010
27. 2.27
Example 2.22
What is the binary equivalent of for (24)What is the binary equivalent of for (24)88??
SolutionSolution
Write each octal digit as its equivalent bit pattern to getWrite each octal digit as its equivalent bit pattern to get
2 → 010 and 4 → 1002 → 010 and 4 → 100
The result is (010100)The result is (010100)22..