01.number systems
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ITEC 1011 Introduction to Information Technologies
1. Number Systems
Chapt. 2
Location in course textbook
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ITEC 1011 Introduction to Information Technologies
Bit & Byte
• Computer uses the binary system. • Any physical system that can exist in two distinct states
(e.g., 0-1, on-off, hi-lo, yes-no, up-down, north-south, etc.) has the potential of being used to represent numbers or characters.
• A binary digit is called a bit. There are two possible states in a bit, usually expressed as 0 and 1.o o A series of eight bits strung together makes a byte,
much as 12 makes a dozen. o With 8 bits, or 8 binary digits, there exist 2^8=256
possible combinations.
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ITEC 1011 Introduction to Information Technologies
combinations• The following table shows some of these combinations. (The number enclosed in parentheses
represents the decimal equivalent.)
• 00000000 ( 0) 00010000 ( 16) 00100000 ( 32) ... 01110000 (112) 00000001 ( 1) 00010001 ( 17) 00100001 ( 33) ... 01110001 (113) 00000010 ( 2) 00010010 ( 18) 00100010 ( 34) ... 01110010 (114) 00000011 ( 3) 00010011 ( 19) 0010011 ( 35) ... 01110011 (115) 00000100 ( 4) 00010100 ( 20) 00100100 ( 36) ... 01110100 (116) 00000101 ( 5) 00010101 ( 21) 00100101 ( 37) ... 01110101 (117) 00000110 ( 6) 00010110 ( 22) 00100110 ( 38) ... 01110110 (118) 00000111 ( 7) 00010111 ( 23) 00100111 ( 39) ... 01110111 (119) 00001000 ( 8) 00011000 ( 24) 00101000 ( 40) ... 01111000 (120) 00001001 ( 9) 00011001 ( 25) 00101001 ( 41) ... 01111001 (121) 00001010 ( 10) 00011010 ( 26) 00101010 ( 42) ... 01111010 (122) 00001011 ( 11) 00011011 ( 27) 00101011 ( 43) ... 01111011 (123) 00001100 ( 12) 00011100 ( 28) 00101100 ( 44) ... 01111100 (124) 00001101 ( 13) 00011101 ( 29) 00101101 ( 45) ... 01111101 (125) 00001110 ( 14) 00011110 ( 30) 00101110 ( 46) ... 01111110 (126) 00001111 ( 15) 00011111
( 31) 00101111 ( 47) ... 01111111 (127)
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ITEC 1011 Introduction to Information Technologies
Decimal
For example, 1234 : means that there are four boxes (digits); and there are 4 one's in the right-most box (least significant digit), 3 ten's in the next box, 2 hundred's in the next box, and finally 1 thousand's in the left-most box (most significant digit). The total is 1234:
Original Number: 1 2 3 4
| | | |
How Many Tokens: 1 2 3 4
Digit/Token Value: 1000 100 10 1
Value: 1000 + 200 + 30 + 4 = 1234
or simply, 1*1000 + 2*100 + 3*10 + 4*1 = 1234,
Thus, each digit has a value: 10^0=1 for the least significant digit, increasing to 10^1=10, 10^2=100, 10^3=1000, and so forth.
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ITEC 1011 Introduction to Information Technologies
Common Number Systems
System Base Symbols
Used by humans?
Used in computers?
Decimal 10 0, 1, … 9 Yes No
Binary 2 0, 1 No Yes
Octal 8 0, 1, … 7 No No
Hexa-decimal
16 0, 1, … 9,
A, B, … F
No No
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ITEC 1011 Introduction to Information Technologies
Quantities/Counting (1 of 3)
Decimal Binary Octal
Hexa-decimal
0 0 0 0
1 1 1 1
2 10 2 2
3 11 3 3
4 100 4 4
5 101 5 5
6 110 6 6
7 111 7 7p. 33
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ITEC 1011 Introduction to Information Technologies
Quantities/Counting (2 of 3)
Decimal Binary Octal
Hexa-decimal
8 1000 10 8
9 1001 11 9
10 1010 12 A
11 1011 13 B
12 1100 14 C
13 1101 15 D
14 1110 16 E
15 1111 17 F
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ITEC 1011 Introduction to Information Technologies
Quantities/Counting (3 of 3)
Decimal Binary Octal
Hexa-decimal
16 10000 20 10
17 10001 21 11
18 10010 22 12
19 10011 23 13
20 10100 24 14
21 10101 25 15
22 10110 26 16
23 10111 27 17 Etc.
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ITEC 1011 Introduction to Information Technologies
Conversion Among Bases
• The possibilities:
Hexadecimal
Decimal Octal
Binary
pp. 40-46
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ITEC 1011 Introduction to Information Technologies
Quick Example
2510 = 110012 = 318 = 1916
Base
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ITEC 1011 Introduction to Information Technologies
Decimal to Decimal (just for fun)
Hexadecimal
Decimal Octal
Binary
Next slide…
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ITEC 1011 Introduction to Information Technologies
12510 => 5 x 100 = 52 x 101 = 201 x 102 = 100
125
Base
Weight
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ITEC 1011 Introduction to Information Technologies
Binary to Decimal
Hexadecimal
Decimal Octal
Binary
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ITEC 1011 Introduction to Information Technologies
Binary to Decimal
• Technique– Multiply each bit by 2n, where n is the “weight”
of the bit– The weight is the position of the bit, starting
from 0 on the right– Add the results
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ITEC 1011 Introduction to Information Technologies
Example
1010112 => 1 x 20 = 11 x 21 = 20 x 22 = 01 x 23 = 80 x 24 = 01 x 25 = 32
4310
Bit “0”
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ITEC 1011 Introduction to Information Technologies
Octal to Decimal
Hexadecimal
Decimal Octal
Binary
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ITEC 1011 Introduction to Information Technologies
Octal to Decimal
• Technique– Multiply each bit by 8n, where n is the “weight”
of the bit– The weight is the position of the bit, starting
from 0 on the right– Add the results
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ITEC 1011 Introduction to Information Technologies
Example
7248 => 4 x 80 = 42 x 81 = 167 x 82 = 448
46810
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ITEC 1011 Introduction to Information Technologies
Hexadecimal to Decimal
Hexadecimal
Decimal Octal
Binary
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ITEC 1011 Introduction to Information Technologies
Hexadecimal to Decimal
• Technique– Multiply each bit by 16n, where n is the “weight
” of the bit– The weight is the position of the bit, starting
from 0 on the right– Add the results
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ITEC 1011 Introduction to Information Technologies
Example
ABC16 => C x 160 = 12 x 1 = 12 B x 161 = 11 x 16 = 176 A x 162 = 10 x 256 = 2560
274810
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ITEC 1011 Introduction to Information Technologies
Decimal to Binary
Hexadecimal
Decimal Octal
Binary
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ITEC 1011 Introduction to Information Technologies
Decimal to Binary
• Technique– Divide by two, keep track of the remainder– First remainder is bit 0 (LSB, least-significant
bit)– Second remainder is bit 1– Etc.
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ITEC 1011 Introduction to Information Technologies
Example
12510 = ?22 125 62 12 31 02 15 12 7 12 3 12 1 12 0 1
12510 = 11111012
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ITEC 1011 Introduction to Information Technologies
Octal to Binary
Hexadecimal
Decimal Octal
Binary
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ITEC 1011 Introduction to Information Technologies
Octal to Binary
• Technique– Convert each octal digit to a 3-bit equivalent
binary representation
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ITEC 1011 Introduction to Information Technologies
Example
7058 = ?2
7 0 5
111 000 101
7058 = 1110001012
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ITEC 1011 Introduction to Information Technologies
Hexadecimal to Binary
Hexadecimal
Decimal Octal
Binary
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ITEC 1011 Introduction to Information Technologies
Hexadecimal to Binary
• Technique– Convert each hexadecimal digit to a 4-bit
equivalent binary representation
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ITEC 1011 Introduction to Information Technologies
Example
10AF16 = ?2
1 0 A F
0001 0000 1010 1111
10AF16 = 00010000101011112
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ITEC 1011 Introduction to Information Technologies
Decimal to Octal
Hexadecimal
Decimal Octal
Binary
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ITEC 1011 Introduction to Information Technologies
Decimal to Octal
• Technique– Divide by 8– Keep track of the remainder
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ITEC 1011 Introduction to Information Technologies
Example
123410 = ?8
8 1234 154 28 19 28 2 38 0 2
123410 = 23228
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ITEC 1011 Introduction to Information Technologies
Decimal to Hexadecimal
Hexadecimal
Decimal Octal
Binary
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ITEC 1011 Introduction to Information Technologies
Decimal to Hexadecimal
• Technique– Divide by 16– Keep track of the remainder
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ITEC 1011 Introduction to Information Technologies
Example
123410 = ?16
123410 = 4D216
16 1234 77 216 4 13 = D16 0 4
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ITEC 1011 Introduction to Information Technologies
Binary to Octal
Hexadecimal
Decimal Octal
Binary
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ITEC 1011 Introduction to Information Technologies
Binary to Octal
• Technique– Group bits in threes, starting on right– Convert to octal digits
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ITEC 1011 Introduction to Information Technologies
Example
10110101112 = ?8
1 011 010 111
1 3 2 7
10110101112 = 13278
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ITEC 1011 Introduction to Information Technologies
Binary to Hexadecimal
Hexadecimal
Decimal Octal
Binary
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ITEC 1011 Introduction to Information Technologies
Binary to Hexadecimal
• Technique– Group bits in fours, starting on right– Convert to hexadecimal digits
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ITEC 1011 Introduction to Information Technologies
Example
10101110112 = ?16
10 1011 1011
2 B B
10101110112 = 2BB16
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ITEC 1011 Introduction to Information Technologies
Octal to Hexadecimal
Hexadecimal
Decimal Octal
Binary
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ITEC 1011 Introduction to Information Technologies
Octal to Hexadecimal
• Technique– Use binary as an intermediary
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ITEC 1011 Introduction to Information Technologies
Example
10768 = ?16
1 0 7 6
001 000 111 110
2 3 E
10768 = 23E16
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ITEC 1011 Introduction to Information Technologies
Hexadecimal to Octal
Hexadecimal
Decimal Octal
Binary
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ITEC 1011 Introduction to Information Technologies
Hexadecimal to Octal
• Technique– Use binary as an intermediary
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ITEC 1011 Introduction to Information Technologies
Example
1F0C16 = ?8
1 F 0 C
0001 1111 0000 1100
1 7 4 1 4
1F0C16 = 174148
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ITEC 1011 Introduction to Information Technologies
Exercise – Convert ...
Don’t use a calculator!
Decimal Binary Octal
Hexa-decimal
33
1110101
703
1AF
Skip answer Answer
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ITEC 1011 Introduction to Information Technologies
Exercise – Convert …
Decimal Binary Octal
Hexa-decimal
33 100001 41 21
117 1110101 165 75
451 111000011 703 1C3
431 110101111 657 1AF
Answer
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ITEC 1011 Introduction to Information Technologies
Common Powers (1 of 2)
• Base 10Power Preface Symbol
10-12 pico p
10-9 nano n
10-6 micro
10-3 milli m
103 kilo k
106 mega M
109 giga G
1012 tera T
Value
.000000000001
.000000001
.000001
.001
1000
1000000
1000000000
1000000000000
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ITEC 1011 Introduction to Information Technologies
Common Powers (2 of 2)
• Base 2Power Preface Symbol
210 kilo k
220 mega M
230 Giga G
Value
1024
1048576
1073741824
• What is the value of “k”, “M”, and “G”?• In computing, particularly w.r.t. memory, the base-2 interpretation generally applies
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ITEC 1011 Introduction to Information Technologies
Example
/ 230 =
In the lab…1. Double click on My Computer2. Right click on C:3. Click on Properties
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ITEC 1011 Introduction to Information Technologies
Exercise – Free Space
• Determine the “free space” on all drives on a machine in the lab
Drive
Free space
Bytes GB
A:
C:
D:
E:
etc.
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ITEC 1011 Introduction to Information Technologies
Review – multiplying powers
• For common bases, add powers
26 210 = 216 = 65,536
or…
26 210 = 64 210 = 64k
ab ac = ab+c
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ITEC 1011 Introduction to Information Technologies
Binary Addition (1 of 2)
• Two 1-bit values
pp. 36-38
A B A + B
0 0 0
0 1 1
1 0 1
1 1 10“two”
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ITEC 1011 Introduction to Information Technologies
Binary Addition (2 of 2)
• Two n-bit values– Add individual bits– Propagate carries– E.g.,
10101 21+ 11001 + 25 101110 46
11
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ITEC 1011 Introduction to Information Technologies
Multiplication (1 of 3)
• Decimal (just for fun)
pp. 39
35x 105 175 000 35 3675
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ITEC 1011 Introduction to Information Technologies
Multiplication (2 of 3)
• Binary, two 1-bit values
A B A B
0 0 0
0 1 0
1 0 0
1 1 1
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ITEC 1011 Introduction to Information Technologies
Multiplication (3 of 3)
• Binary, two n-bit values– As with decimal values– E.g.,
1110 x 1011 1110 1110 0000 111010011010
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ITEC 1011 Introduction to Information Technologies
Fractions
• Decimal to decimal (just for fun)
pp. 46-50
3.14 => 4 x 10-2 = 0.041 x 10-1 = 0.1
3 x 100 = 3 3.14
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ITEC 1011 Introduction to Information Technologies
Fractions
• Binary to decimal
pp. 46-50
10.1011 => 1 x 2-4 = 0.06251 x 2-3 = 0.1250 x 2-2 = 0.01 x 2-1 = 0.50 x 20 = 0.01 x 21 = 2.0 2.6875
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ITEC 1011 Introduction to Information Technologies
Fractions
• Decimal to binary
p. 50
3.14579
.14579x 20.29158x 20.58316x 21.16632x 20.33264x 20.66528x 21.33056
etc.11.001001...
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ITEC 1011 Introduction to Information Technologies
Exercise – Convert ...
Don’t use a calculator!
Decimal Binary Octal
Hexa-decimal
29.8
101.1101
3.07
C.82
Skip answer Answer
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ITEC 1011 Introduction to Information Technologies
Exercise – Convert …
Decimal Binary Octal
Hexa-decimal
29.8 11101.110011… 35.63… 1D.CC…
5.8125 101.1101 5.64 5.D
3.109375 11.000111 3.07 3.1C
12.5078125 1100.10000010 14.404 C.82
Answer
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ITEC 1011 Introduction to Information Technologies
Thank you
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