Binary, Octal and Hexidecimal numbers

• Computers can input and output decimal numbers but they convert them to internal binary representation.

• Binary is good for computers, hard for us to read

  • Use numbers easily computed from binary

• Binary numbers use only two different digits: {0,1}

  • Example: 120010 = 00000100101100002

• Octal numbers use 8 digits: {0 - 7}

  • Example: 120010 = 042608

• Hexidecimal numbers use 16 digits: {0-9, A-F}

  • Example: 120010 = 04B016 = 0x04B0
  • does not distinguish between upper and lower case

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