Question

what are pure and impure expressions in java​

Answer 1

Answer:

A pure function may not change the variable it's passed. An impure function does, so for example if you pass the variable x to the function int addOne(x);, add one could return x + 1, and not change x(pure), or addOne(x); could increment x by one, so the value of the variable x is now changed.

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Answer 2

Answer:

A pure expression contains the element of the same data type whereas an impure expression contains element of different data types.