DerekChiou_EE306_Spring2009_Lecture4_afterLecture

DerekChiou_EE306_Spring2009_Lecture4_afterLecture - 1 8 23...

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© Derek Click to edit Master subtitle style 2/2/2009 © Derek Chiou : EE306: Lecture 4 306: Floating Point, ASCII, Logical Equations Prof. Derek Chiou University of Texas at Austin
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Administration l My office hours l M 5PM-6PM l T 5PM-6PM l Or by appointment
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l Recap l Converting between bases l Logical operations on bits. AND, OR, NOT. l Other representations l Bit vector l Floating point l Outline l Review floating point l Discuss ASCII l Subtracting l Logical Equations
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Floating Point: How Many Numbers Can You l But, what numbers? l Assume only have exponent
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32b Floating Point S Exponent Mantissa (fraction)
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Unformatted text preview: 1 8 23 N = (-1)S * 1.fraction * 2 exponent-127 normalized 1<= exponent<=254 32b Floating Point: (Exponent == 0) S Exponent Mantissa (fraction) 1 8 23 N = (-1)S * 0.fraction * 2 exponent-126 normalized If exponent == 0 ASCII l American Standard Code for Information Interchange l Each keyboard key is identified by a unique ASCII code (integer) l ASCII(0) = 0d48 l ASCII(1) = 0d49 l ASCII(9) = 0d57 l ASCII(a) = 0d97 l ASCII(z) = 0d122 l Etc. Logical Equations l Should_I_Throw_A_Party == A & B + C Logical Gates...
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