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Fixed-point number representation

Fixed position for the radix point .

Fxed number of digits to the left and right of the radix point

Need many digits to represent a practical range of numbers

.E.g., 2.64 in decimal .

A trillion (1 000 000 000 000) needs at least 40 bits to the left of the radix point 1012as is roughly 240

Very large or small numbers place greater demands on computer

very large:

mass of the earth: 5.98 x 1024 kg

speed of light: 3.0 x 108 ms-1

very small:

charge on an electron: -1.60 x 10-19C