What is different between "Arithmetic Calculation" and "Calculation" in computer science? What is different when you say "Arithmetic Calculation" and "Calculation" in the context of the computer science?

The "arithmetic" in the former seems needless to me since all calculations are arithmetic.

Is there some meaning that is enhanced by adding "arithmetic" in this case?

Thank you in advance.
"Arithmetic calculations" are those involving addition, subtraction, multiplication and division of numbers. eg (2+13)/5 

There are also "algebraic calculations"  eg Find y such that y + 2x = 13 and more.