1 homework hints algorithms. 2 converting positive numbers base 2 to base 16 base 16 to base 2 base...
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![Page 1: 1 Homework Hints Algorithms. 2 Converting Positive Numbers Base 2 to base 16 Base 16 to base 2 Base 16 to base 10 Base 2 to base 10 Base 10 to base 2](https://reader035.vdocument.in/reader035/viewer/2022081421/56649d565503460f94a34230/html5/thumbnails/1.jpg)
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Homework Hints
Algorithms
![Page 2: 1 Homework Hints Algorithms. 2 Converting Positive Numbers Base 2 to base 16 Base 16 to base 2 Base 16 to base 10 Base 2 to base 10 Base 10 to base 2](https://reader035.vdocument.in/reader035/viewer/2022081421/56649d565503460f94a34230/html5/thumbnails/2.jpg)
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Converting Positive Numbers
Base 2 to base 16 Base 16 to base 2 Base 16 to base 10 Base 2 to base 10 Base 10 to base 2 Base 10 to base 16
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Converting positive numbers: base 2 to base 16 Put the digits into groups of 4 starting at
the right If the last group has last than 4 digits,
extend it with leading 0s Convert each group of 4 according to
the following translation 0000 -> 0, 0001 -> 1, 0010 -> 2, 0011 ->3 0100 -> 4, 0101 -> 5, 0110 -> 6, 0111 -> 7 1000 -> 8, 1001 -> 9, 1010 -> A, 1011 -> B 1100 -> C, 1101 -> D, 1110 -> E, 1111 -> F
![Page 4: 1 Homework Hints Algorithms. 2 Converting Positive Numbers Base 2 to base 16 Base 16 to base 2 Base 16 to base 10 Base 2 to base 10 Base 10 to base 2](https://reader035.vdocument.in/reader035/viewer/2022081421/56649d565503460f94a34230/html5/thumbnails/4.jpg)
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Example:0110010010010012 to base 16
011 0010 0100 10013 2 4 93249
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Converting positive numbers: base 16 to base 2 Convert each digit into a group of 4
according to the following translation 0 -> 0000, 1 -> 0001, 2 -> 0010, 3 -> 0011 4 -> 0100, 5 -> 0101, 6 -> 0110, 7 -> 0111 8 -> 1000, 9 -> 1001, A -> 1010, B -> 1011 C -> 1100, D -> 1101, E -> 1110, F -> 1111
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Example:8EF16 to base 2
8 = 1000E = 1110F = 1111
100011101111
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Converting positive numbers: base 16 to base 10 Expand the number into its component values:
face-value x position value Position value
rightmost digit, position value = 160
Moving right to left, the exponent in each position increases by 1 (161, 162, 163, … )
Face value 0 - 9 are their face values A - F are 10 – 15 respectively
Convert each exponent to its decimal equivalent Multiply each face-value pair together Add the values together
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Example:CAB16 to base 10
C x 162 + A x 161 + B x 160 = 12 x 256 + 10 x 16 + 11 x 1 = 3072 + 160 + 11 = 3243
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Converting positive numbers: base 2 to base 10 Expand the number into its component values:
face-value x position value Position value
rightmost digit, position value = 20
Moving right to left, the exponent in each position increases by 1 (21, 22, 23, … )
Face value 0 = 0, 1 = 1
Eliminate all the 0 terms Simplify each 1x2n to 2n
Convert each exponent to its decimal equivalent
Add the values together
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Example:1100101010112 to base 10
1x211 + 1x210 + 0x29 + 0x28 + 1x27 + 0x26 + 1x25 + 0x24 + 1x23 + 0x22 + 1x21 + 1x20 =
1x211 + 1x210 + 1x27 + 1x25 + 1x23 + 1x21 + 1x20 =
211 + 210 + 27 + 25 + 23 + 21 + 20 = 2048 + 1024 + 128 + 32 + 8 + 2 + 1
= 3243
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Converting positive numbers: base 10 to base 2
1. Divide the number by 22. Use the remainder as the next
number (beginning at the right)3. If the result is 0 then stop4. Use the result as the next
number and go to step 1
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Example:327 to base 2
327 / 2 = 163 r 1 answer 1163 / 2 = 81 r 1 answer 1181 /2 = 40 r 1 answer 11140 / 2 = 20 r 0 answer 011120 / 2 = 10 r 0 answer 0011110 / 2 = 5 r 0 answer 0001115 / 2 = 2 r 1 answer 10001112 / 2 = 1 r 0 answer 010001111 / 2 = 0 r 1 answer 101000111
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Converting positive numbers: base 10 to base 16
1. Divide the number by 162. Use the remainder as the next number
(beginning at the right)1. If the remainder is less than 10, use the
number directly, else convert it to a letter using 10->A, 11->B, 12->C, 13->D, 14->E, 15->F
3. If the result is 0 then stop4. Use the result as the next number and
go to step 1
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Example:327 to base 16
327 / 16 = 20 r 7 answer 716
20 / 16 = 1 r 4 answer 4716
1 / 16 = 0 r 1 answer 14716
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Two’s Complement Convert a positive base 10 number
to binary two’s complement Convert a negative base 10 number
to binary two’s complement Convert a positive base 10 number
to hexadecimal two’s complement Convert a negative base 10 number
to hexadecimal two’s complement
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Convert a positive base 10 number to binary two’s complement
Convert the number to base 2 as described on slide 11
Fill in all leading spaces with 0’s
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Example: 52 to binary two’s complement
52/2 = 26 r 1 126/2 = 13 r 0 0113/2 = 6 r 1 101 6/2 = 3 r 0 0101 3/2 = 1 r 1 10101 1/2 = 0 r 1 110101Extend to 16-bit field: 0000000000110101
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Convert a negative base 10 number to binary two’s complement
Convert the positive value of number to binary as described on slide 11
Fill in all leading spaces with 0’s Flip all digits: 0 -> 1, 1 -> 0 Add binary 1 to the number,
remembering the following rules: 0+0=0, 0+1=1, 1+0=1, 1+1=10
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Example: -52 to binary two’s complement52/2 = 26 r 1 126/2 = 13 r 0 0113/2 = 6 r 1 101 6/2 = 3 r 0 0101 3/2 = 1 r 1 10101 1/2 = 0 r 1 110101
extend to 16 bits 0000000000110101
Flip the bits and add 1 1111111111001010+ 1 1111111111001011
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Convert a positive base 10 number to hexadecimal two’s complement Convert the number to base 2 as described on
slide 11 Fill in all leading spaces with 0’s Put the digits into groups of 4 starting at the
right Convert each group of 4 according to the
following translation 0000 -> 0, 0001 -> 1, 0010 -> 2, 0011 ->3 0100 -> 4, 0101 -> 5, 0110 -> 6, 0111 -> 7 1000 -> 8, 1001 -> 9, 1010 -> A, 1011 -> B 1100 -> C, 1101 -> D, 1110 -> E, 1111 -> F
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Example: 52 to hexadecimal two’s complement52/2 = 26 r 1 126/2 = 13 r 0 0113/2 = 6 r 1 101 6/2 = 3 r 0 0101 3/2 = 1 r 1 10101 1/2 = 0 r 1 1101010000000000110101
0000 0000 0011 0101003516
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Convert a negative base 10 number to binary two’s complement Convert the positive value of number to binary as
described on slide 11 Fill in all leading spaces with 0’s Flip all digits: 0 -> 1, 1 -> 0 Add binary 1 to the number, remembering the following
rules: 0+0=0, 0+1=1, 1+0=1, 1+1=10
Put the digits into groups of 4 starting at the right Convert each group of 4 according to the following
translation 0000 -> 0, 0001 -> 1, 0010 -> 2, 0011 ->3 0100 -> 4, 0101 -> 5, 0110 -> 6, 0111 -> 7 1000 -> 8, 1001 -> 9, 1010 -> A, 1011 -> B 1100 -> C, 1101 -> D, 1110 -> E, 1111 -> F
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Example: -52 to binary two’s complement52/2 = 26 r 1 126/2 = 13 r 0 0113/2 = 6 r 1 101 6/2 = 3 r 0 0101 3/2 = 1 r 1 10101 1/2 = 0 r 1 110101
0000000000110101
1111111111001010+ 1 1111111111001011
1111 1111 1100 1011FFCB16
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Two’s Complement Operations
Binary addition Binary subtraction Binary comparison Hexadecimal addition Hexadecimal subtraction Hexadecimal comparison
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Binary addition
Add the two numbers If the carry into the leftmost digit is
not the same as the carry out, define it as an overflow
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Example
00000000101110102
+00000000101010112
00000001011001012
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Binary subtraction Convert the second number into it’s
negative by Flipping each bit (0->1, 1->0) Add binary 1 to the number, remembering
the following rules: 0+0=0, 0+1=1, 1+0=1, 1+1=10
Add the two numbers If the carry into the leftmost digit is not
the same as the carry out, define it as an overflow and stop
![Page 28: 1 Homework Hints Algorithms. 2 Converting Positive Numbers Base 2 to base 16 Base 16 to base 2 Base 16 to base 10 Base 2 to base 10 Base 10 to base 2](https://reader035.vdocument.in/reader035/viewer/2022081421/56649d565503460f94a34230/html5/thumbnails/28.jpg)
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Example 00000000101110102
- 00000000101010112
negate 00000000101010112 -> 1111111101010100+ 1 1111111101010101
00000000101110102
+11111111010101012
00000000000011112
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Binary comparison
Subtract the two numbers as described in slide 27
Comparison If result is positive (first bit 0), first
number is greater If result is negative (first bit 0 and not
all others are 0), first number is smaller If result is zero, numbers are equal
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Example
00000000101110102
- 00000000101010112
00000000000011112
First number is greater than the
second
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Hexadecimal addition Convert both numbers into binary as described
in slide 5 Add the two numbers If the carry into the leftmost digit is not the
same as the carry out, define it as an overflow and stop
Put the digits into groups of 4 Convert each group of 4 according to the
following translation 0000 -> 0, 0001 -> 1, 0010 -> 2, 0011 ->3 0100 -> 4, 0101 -> 5, 0110 -> 6, 0111 -> 7 1000 -> 8, 1001 -> 9, 1010 -> A, 1011 -> B 1100 -> C, 1101 -> D, 1110 -> E, 1111 -> F
![Page 32: 1 Homework Hints Algorithms. 2 Converting Positive Numbers Base 2 to base 16 Base 16 to base 2 Base 16 to base 10 Base 2 to base 10 Base 10 to base 2](https://reader035.vdocument.in/reader035/viewer/2022081421/56649d565503460f94a34230/html5/thumbnails/32.jpg)
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Example: BA16 + AB16
BA16 AB16
1011 1010 1010 10110000000010111010 0000000010101011
0000000010111010+0000000010101011 0000000101100101
0000 0001 0110 0101016516
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Alternative algorithm:hexadecimal addition table
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 0 1 2 3 4 5 6 7 8 9 A B C D E F
1 1 2 3 4 5 6 7 8 9 A B C D E F 10
2 2 3 4 5 6 7 8 9 A B C D E F 10 11
3 3 4 5 6 7 8 9 A B C D E F 10 11 12
4 4 5 6 7 8 9 A B C D E F 10 11 12 13
5 5 6 7 8 9 A B C D E F 10 11 12 13 14
6 6 7 8 9 A B C D E F 10 11 12 13 14 15
7 7 8 9 A B C D E F 10 11 12 13 14 15 16
8 8 9 A B C D E F 10 11 12 13 14 15 16 17
9 9 A B C D E F 10 11 12 13 14 15 16 17 18
A A B C D E F 10 11 12 13 14 15 16 17 18 19
B B C D E F 10 11 12 13 14 15 16 17 18 19 1A
C C D E F 10 11 12 13 14 15 16 17 18 19 1A 1B
D D E F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C
E E F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D
F F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E
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Example: BA16 + AB16
(1) BA16
+AB16
------------
516
BA16
+AB16
------------
16516
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Hexadecimal subtraction Convert both numbers into binary as described
in slide 5 Convert the second number into it’s negative
by Flipping each bit (0->1, 1->0) Add binary 1 to the number, remembering the
following rules: 0+0=0, 0+1=1, 1+0=1, 1+1=10
Add the two numbers If the carry into the leftmost digit is not the
same as the carry out, define it as an overflow
![Page 36: 1 Homework Hints Algorithms. 2 Converting Positive Numbers Base 2 to base 16 Base 16 to base 2 Base 16 to base 10 Base 2 to base 10 Base 10 to base 2](https://reader035.vdocument.in/reader035/viewer/2022081421/56649d565503460f94a34230/html5/thumbnails/36.jpg)
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Example: BA16 - AB16 BA16 AB16
1011 1010 1010 10110000000010111010 0000000010101011
00000000101110102
- 00000000101010112
negate 00000000101010112 -> 1111111101010100+ 1 1111111101010101
00000000101110102
+11111111010101012
00000000000011112
0000 0000 0000 11112
000F16
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Alternative algorithm:hexadecimal subtraction table borrow not needed borrow needed
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 0 1 2 3 4 5 6 7 8 9 A B C D E F
1 F 0 1 2 3 4 5 6 7 8 9 A B C D E
2 E F 0 1 2 3 4 5 6 7 8 9 A B C D
3 D E F 0 1 2 3 4 5 6 7 8 9 A B C
4 C D E F 0 1 2 3 4 5 6 7 8 9 A B
5 B C D E F 0 1 2 3 4 5 6 7 8 9 A
6 A B C D E F 0 1 2 3 4 5 6 7 8 9
7 9 A B C D E F 0 1 2 3 4 5 6 7 8
8 8 9 A B C D E F 0 1 2 3 4 5 6 7
9 7 8 9 A B C D E F 0 1 2 3 4 5 6
A 6 7 8 9 A B C D E F 0 1 2 3 4 5
B 5 6 7 8 9 A B C D E F 0 1 2 3 4
C 4 5 6 7 8 9 A B C D E F 0 1 2 3
D 3 4 5 6 7 8 9 A B C D E F 0 1 2
E 2 3 4 5 6 7 8 9 A B C D E F 0 1
F 1 2 3 4 5 6 7 8 9 A B C D E F 0
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Example: BA16 - AB16
A B 1A16
- A B16
------------
F16