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Number System Presentation

Number System and Conversion

Oct 30, 2014

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Number System and Conversion. 350151- Digital Circuit Choopan Rattanapoka. Introduction. Many number systems are in use in digital technology. The most common are : Decimal (Base 10) Binary (Base 2) Octal (Base 8) Hexadecimal (Base 16)

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Number System and Conversion 350151- Digital Circuit ChoopanRattanapoka

Introduction • Many number systems are in use in digital technology. The most common are : • Decimal (Base 10) • Binary (Base 2) • Octal (Base 8) • Hexadecimal (Base 16) • The decimal system is the number system that we use everyday

Number System • Decimal system uses symbols (digits) for the ten values 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 • Binary System uses digits for the two values 0,and 1 • Octal System uses digits for the eight values 0, 1, 2, 3, 4, 5, 6, 7 • Hexadecimal System uses digits for the sixteen values 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F to represent any number, no matter how large or how small.

Decimal System • The decimal system is composed of 10 numerals or symbols. These 10 symbols are 0,1,2,3,4,5,6,7,8,9; using these symbols as digits of a number, we can express any quantity. • Example : 3501.51 digit Most Significant Digit Least Significant Digit decimal point

Binary System • The binary system is composed of 2 numerals or symbols 0 and 1; using these symbols as digits of a number, we can express any quantity. • Example : 1101.01 bit Most Significant Bit Least Significant Bit binary point

Decimal Number Quantity (positional number) • 3 5 0 1 (base-10) 1 X 100 = 1 0 X 101 = 0 5 X 102 = 500 3 X 103 = 3000 3000 + 500 + 0 + 1 = 3501

Binary-to-Decimal Conversion • 1 1 0 1 (base-2) 1 X 20 = 1 0 X 21 = 0 1 X 22 = 4 1 X 23 = 8 8 + 4 + 0 + 1 = 13 11012= 1310

Octal-to-Decimal Conversion • 5 2 1 7 (base-8) 7 X 80= 7x1 = 7 1 X 81= 1x8 = 8 2 X 82= 2x64 = 128 5 X 83= 5x512 = 2560 2560 + 128 + 8 + 7 = 2703 52178 = 270310

Hexadecimal-to-Decimal Conversion • 1 A C F (base-16) [ A = 10, B = 11, C = 12, D = 13, E = 14, F = 15 ] 15 X 160=15x1 = 15 12 X 161=12x16 = 192 10 X 162=10x256 = 2560 1 X 163= 5x4096 = 20480 20480 + 2560 +192 + 15 = 23247 1ACF16 = 2324710

Decimal Number Quantity (fractional number) • . 5 8 1 (base-10) 5 X 10-1 = 5x0.1 = 0.5 8 X 10-2 = 8x0.01 = 0.08 1 X 10-3= 1x0.001 = 0.001 0.5 + 0.08 + 0.001 = 0.581

Binary-to-Decimal Conversion • . 1 0 1 (base-2) 1 X 2-1 = 1x0.5 = 0.5 0 X 2-2 = 0x0.25 = 0 1 X 2-3= 1x0.125 = 0.125 0.5 + 0 + 0.125 = 0.625 0.1012 = 0.62510

Octal-to-Decimal Conversion • . 2 5 (base-8) 2 X 8-1 = 2x0.125 = 0.25 5 X 8-2 = 5x0.015625 = 0.017825 0.25 + 0.017825 = 0.267825 0.258 = 0.26782510

Hexadecimal-to-Decimal Conversion • . F 5 (base-16) 15 X16-1 = 15x0.0625 = 0.9375 5 X16-2 = 5x0.00390625 = 0.01953125 0.9375 + 0.01953125 = 0.95703125 0.F516 = 0.9570312510

Exercise 1 • Convert these binary system numbers to decimal system numbers • 100101101 • 11100.1001 • 111111 • 100000.0111

Decimal-to-Binary Conversion (positional number) • 2 5 0 25010 = 1 1 1 1 1 0 1 02 2 250 2 125 Remainder 0 2 62 Remainder 1 2 31 Remainder 0 2 15 Remainder 1 2 7 Remainder 1 2 3 Remainder 1 1 Remainder 1

Decimal-to-Octal Conversion • 2 5 0 8 250 8 31 Remainder 2 3 Remainder 7 25010 = 3728

Decimal-to-Hexadecimal Conversion • 2 5 0 16 250 15 Remainder 10 25010 = 15 1016 ? = FA16

Decimal-to-Binary Conversion (fractional number) • 0 . 4375 0.4375 x 2 = 0.8750 0.8750 x 2 = 1.75 0.75 x 2 = 1.5 0.5 x 2 = 1.0 0.437510 = 0.01112

Decimal-to-Octal Conversion • 0 . 4375 0.4375 x 8 = 3.5 0.5 x 8 = 4.0 0.437510 = 0.348

Decimal-to-Hexadecimal Conversion • 0 . 4375 0.4375 x 16 = 7.0 0.437510 = 0.716

Example :Decimal-to-Binary Conversion (Estimation) 110012  2-1 + 2-2+ 2-5  0.5 + 0.25 +0.03125  0.78125 • 0 . 7 8 2 0.782 x 2 = 1.564 0.564 x 2 = 1.128 0.128 x 2 = 0.256 0.256 x 2 = 0.512 0.512 x 2 = 1.024 0.024 x 2 = 0.048 0.048 x 2 = 0.096 0.192 x 2 = 0.384 0.384 x 2 = 0.768 0.768 x 2 = 1.536 11001000012  2-1 + 2-2+ 2-5 + 2-10  0.5 + 0.25 +0.03125 + 0.0009765625  0.7822265625

Exercise 2 • Convert these decimal system numbers to binary system numbers • 127 • 38 • 22.5 • 764.375

Base X – to – Base Y Conversion • We can convert base x number to base y number by following these steps : • Convert base x to base 10 (decimal system number) • Then, convert decimal number to base y

Example • Convert 372.348 to hexadecimal system number • Convert 372.348 to decimal system number • 372.348 = (3x82)+(7x81)+(2x80) . (3x8-1) + (4x8-2) = 192 + 56 + 2 . 0.375 + 0.0625 = 250 . 4375 • Convert 250.437510 to hexadecimal system number • 250.437510 Positional number Fractional number 250 / 16 = 15 remainder 10 250  FA16 0.4375 * 16 = 7.0 0.4375  0.716 372.348 = FA.716

Exercise 3 (TODO) • Convert these numbers to octal system number • 11100.10012 • 1111112 • 5A.B16 • Convert these numbers to binary system number • 5A.B16 • 75.28

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Introduction To Number Systems

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