September 2013
Intermediate to advanced
548 pages
12h 25m
English
Content preview from Programming Erlang, 2nd Edition
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Simple Integer Arithmetic
Let’s evaluate some arithmetic expressions.
| | 1> 2 + 3 * 4. |
| | 14 |
| | 2> (2 + 3) * 4. |
| | 20 |
You’ll see that Erlang follows the normal rules for arithmetic
expressions, so 2 + 3 * 4 means 2 + (3 * 4)
and not (2 + 3) * 4.
Erlang uses arbitrary-sized integers for performing integer arithmetic. In Erlang, integer arithmetic is exact, so you don’t have to worry about arithmetic overflows or not being able to represent an integer in a certain word size.
Why not try it? You can impress your friends by calculating with very large numbers.
| | 3> 123456789 * 987654321 * 112233445566778899 * 998877665544332211. |
| | 13669560260321809985966198898925761696613427909935341 |
You can enter integers in a number of ways (for details, see Integers ...
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