January 12 – 16, 2009 CSE 113 B.

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Presentation transcript:

January 12 – 16, 2009 CSE 113 B

Announcements If you have not picked up a syllabus, please do so Assignment #1 – sign and return form on last page of syllabus No class on Friday

What does a computer understand? 0’s and 1’s (zeros and ones)

Bits and Bit Strings The 0 or 1 is called a binary digit (bit). A sequence of bits is called a bit string. 0100101 is a bit string What does it mean/represent?

Interpreting Bit Patterns Binary Two’s complement IEEE 754 ASCII/EBCDIC/Unicode

Conversion from decimal to binary

How do we decode this? 001010101010101010000001011111101010101010001101001001001001001000111111001011101001100111010001010010011100110010101111101000101001010101010101110011100011100100111100000111110101010111101001010010100100100111010010010010100101001100010110010001111010010111010100101001010010101010111001010100101010101111010011010010011110100100100100100100010101101010101010110101101010101010101010101010101111100001101011101001010010010100101001011100111001010101010111010110010101

Question How many distinct 8-bit wide bit strings are there?