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Which is valid to method to increase value of variable by one?

52. Which is valid to method to increase value of variable by one?

1. a++
2. ++a
3. a += 1
4. All of these

Answer: C) a += 1

Explanation:

The Scala programming language doesn't support unary operators (++ or --). In Scala, the binary operators are used to increment and decrement an integer.