Direct algebraic logic (DAL) is a method for entering equations on scientific calculators which allows symbols and numbers to be entered as they are written. SHARP introduced it in 1990s. Today DAL is used almost with every scientific calculator except those which use RPN.
Example: sin(30)
* with non DAL calculator: 30, SIN
* with DAL more natural: SIN, 30, ENTER
External links
* http://sharp-world.com/contents/calculator/features/standard/dal/
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