Is narrow type casting automatic?

Is narrow type casting automatic?

• A. Yes
• B. Sometimes
• C. No
• D. It uses an explicit cast

Answer: (D)

Converting a value from a larger type to a smaller type is a narrowing conversion, and it can lose information. Because of that risk, languages require you to spell out the cast yourself so the programmer explicitly acknowledges the potential data loss. That’s why narrow type casting is done with an explicit cast, like (short) value or (byte) value in languages that use C-style syntax. Widening conversions (smaller to larger) are generally automatic because they cannot lose information, but narrowing conversions are not, hence the need for an explicit cast. So the best description is that narrowing relies on an explicit cast to proceed.

Converting a value from a larger type to a smaller type is a narrowing conversion, and it can lose information. Because of that risk, languages require you to spell out the cast yourself so the programmer explicitly acknowledges the potential data loss. That’s why narrow type casting is done with an explicit cast, like (short) value or (byte) value in languages that use C-style syntax. Widening conversions (smaller to larger) are generally automatic because they cannot lose information, but narrowing conversions are not, hence the need for an explicit cast. So the best description is that narrowing relies on an explicit cast to proceed.