11.09.05

Datateknik.

Different numeral systems. Binary.

23(dec)imal or 23(10)

binary decimal octal hexadecimal

A hex number always corresponds to a group of 4 binary numbers. 

1 2 4     dec
 
0 0 0 = 0
1 0 0 = 1
0 1 0 = 2 
1 1 0 = 3
0 0 1 = 4
1 0 1 = etc. 
0 1 1
1 1 1 
0 0 0
1 0 0
0 1 0
1 1 0
^ ^ ^
^ ^ 000011110000} 8
^ 001100110011} 8
 010101010101} 8

Most Significant Bit MSB and negative powers for decimal point numbers after the decimal point.

Two's complement notation. 

Vice versa from pos to neg and neg to pos