フリー問題

問題文

A byte variable is updated with the compound addition operator and an int operand, and the line compiles. What does the compound operator do that the plain form does not?

選択肢

1. The compound operator automatically performs an implied cast before storing the result.
2. The compound operator automatically performs an early rounding before storing the result.
3. The compound operator automatically performs an added operation before storing the result.
4. The compound operator automatically performs an outer allocation before storing the result.