Lecture 3
Number Representation
Integers

Several bytes together are used to store integers

2 bytes (1/2 word) form a short integer

4 bytes (1 word) form a regular integer

8 bytes (2 words) form a long integer

Computers work with fixed sized numbers, aka
finite precision numbers
(fixed when the computer is
designed and built).
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What does this mean?
Computers can only deal with numbers that can be represented by a fixed number of
digits.
Example: Only positive integer numbers represented by, say, 3 decimal digits
1000 unique numbers (000, 001, 002, …, 999)
Impossible numbers: > 999; negative numbers; fractions; irrational numbers;
complex numbers
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