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SDEV10Feb (Hexadecimal Number system (The principles of positional…

- - - - A byte is used to represent characters in ASCII
      - 2 bytes are used to represent characters in Unicode
    - - Sign it is 0 for positive numbers
      - Sign bit is 1 for negative numbers
    - - 0000(0), 0001 (+1)...1111 (15)
    - - 0000 (0), 0001 (+1)...0111 (+7
  - - - Start with right column, add, carry, move left
    - - If the sum is 2 or more, carry
        
        0+0=0
        
        0+0+carry=1
        
        0+1=1
        
        0+1+carry=0 and carry
        
        1+1=0 and carry
        
        1+1+carry=1and carry
  - - - Zero has two representations, 0000 and 1000
      - adding and subtraction is not consistent.
    - - Start with the positive number
      - Flip all the bits (change 1s to 0s, 0s, to 1s)
      - Add 1: this is the representation of the negative #
    - - Start with +1 (0001)
      - Flip all the bits (1110)
      - Add 1 (1111): this is the representation of -1
  - - - (-1)+ (-1)=-2
        
        1111+1111=1110 ( is discarded carry)
      - (+1)+(-1)=0
        
        0001+1111=*0000
      - Subtraction is the same as adding a negative number
        
        1-1 is the same as (+1)+(-1)
        
        1-(-1) is the same as (+1)+(+1)
- - - - Multiply decimal part by 16 to get remainder
      - Remainder is the rightmost digit (0-9 or A-F)
      - Whole number becomes the new decimal number
      - Repeat until whole number =0