All Flashcards
What is casting?
Converting a variable from one data type to another.
What is widening conversion?
Automatic conversion from a smaller data type to a larger one (e.g., int to double).
What is narrowing conversion?
Manual conversion from a larger data type to a smaller one (e.g., double to int). Requires explicit casting.
What is integer overflow?
Occurs when an integer exceeds its maximum or minimum possible value.
What does truncation mean in casting?
Removing the decimal part of a floating-point number when converting it to an integer.
What is Integer.MAX_VALUE?
The largest possible value for an int.
What is Integer.MIN_VALUE?
The smallest possible value for an int.
What is the syntax for casting a double to an int?
(int) doubleValue
What is explicit casting?
Manually converting one data type to another using the cast operator.
What is implicit casting?
Automatic conversion performed by the compiler without explicit casting.
What happens during integer overflow?
The value wraps around to the opposite end of the integer range.
Why is manual casting needed when converting a double to an int?
To acknowledge the potential loss of precision.
What is the result of casting a double to an int?
The decimal part is truncated; the number is not rounded.
How can casting be used for rounding?
By adding or subtracting 0.5 before casting.
What is the effect of adding 0.5 before casting to int?
Rounds the double to the nearest integer (positive numbers).
What is the effect of subtracting 0.5 before casting to int?
Rounds the double to the nearest integer (negative numbers).
What is the order of operations with casting?
Casting has high precedence; use parentheses for complex expressions.
Why is understanding integer ranges important?
To prevent unexpected behavior caused by integer overflow.
Explain the concept of data type conversion.
Transforming data from one type (e.g., double) to another (e.g., int) to perform operations or store values appropriately.
Describe the importance of explicit casting.
Explicit casting ensures that the programmer is aware of potential data loss or precision changes during type conversion.
What are the steps to round a positive double to the nearest integer using casting?
- Add 0.5 to the double. 2. Cast the result to an int.
What are the steps to round a negative double to the nearest integer using casting?
- Subtract 0.5 from the double. 2. Cast the result to an int.
What are the steps to convert from double to int?
- Use explicit casting: (int) doubleValue.
What are the steps to calculate the average of three doubles and round it to the nearest integer?
- Calculate the average: (num1 + num2 + num3) / 3.0. 2. Add 0.5 to the average. 3. Cast the result to an int.
What are the steps to handle potential integer overflow?
- Check if the result exceeds Integer.MAX_VALUE or Integer.MIN_VALUE. 2. If it does, handle the overflow appropriately (e.g., throw an exception or use a larger data type).