COIS 1010H Lecture Notes - Lecture 10: Binary Number, 11001001, Nibble
30 Mar 2020
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A computer can be logically considered to be a large collection of switches much like a light switch. How many signals can we send with a light switch: two it"s on or off. We"re going to consider that if the switch is on, it"s a 1. So everything that the cpu sees comes as a stream of switch outputs that are either on or off (that we are. If it"s off, it"s a 0 going to consider to be 1s or 0s) Bit: the smallest unit of data that a binary computer can recognize (a single 1 or 0) Byte terminology used to express the size of documents and other files, programs, etc. Prefixes are often used to express larger quantities of bytes: kilobyte (kb), megabyte (mb), gigabyte (gb), etc. We normally use the decimal numbering system, which uses 10 symbols (0,1,2,3,4,5,6,7,8,9) Computers use the binary numbering system, which represents all numbers using just 2 symbols (0 and 1)
