Understanding Data Types, Casting, and Rounding in Java

Mr. Perry introduces casting and data types, focusing on memory usage and conversions in Java. The lesson covers casting between integers and doubles, explaining widening and narrowing conversions. It also teaches rounding techniques for positive and negative integers and explores integer limits and error handling in Java.

Which data type requires the least amount of memory in Java?

• String

• Double

• Integer

• Boolean

Why is it important to understand the memory usage of different data types?

• To ensure compatibility with other programming languages

• To improve code readability

• To optimize program performance

• To reduce the number of lines of code

What is the primary reason for casting an integer to a double in Java?

• To simplify code readability

• To increase the speed of calculations

• To avoid truncation errors during division

• To save memory space

What is a widening conversion in Java?

• Converting a string to a boolean

• Converting an integer to a double

• Converting a boolean to a string

• Converting a double to an integer

What is the result of dividing an integer by another integer in Java without casting?

• An integer value

• A boolean value

• A string value

• A double value

How do you round a positive decimal to the nearest integer in Java?

• Subtract 0.5 and cast to an integer

• Divide by 2 and cast to an integer

• Add 0.5 and cast to an integer

• Multiply by 2 and cast to an integer

Which formula is used to round a negative decimal to the nearest integer?

• Subtract 0.5 and cast to an integer

• Divide by 2 and cast to an integer

• Multiply by 2 and cast to an integer

• Add 0.5 and cast to an integer

What happens when you exceed Integer.MAX_VALUE in Java?

• An error message is displayed

• The value wraps around to Integer.MIN_VALUE

• The value resets to zero

• The program crashes

What is the significance of Integer.MIN_VALUE in Java?

• It represents the smallest possible integer value

• It is used to store large positive numbers

• It is a placeholder for null values

• It indicates the maximum memory usage

How can you identify if you've exceeded the integer range in Java?

• The program will display an error message

• The integer value will become zero

• The program will automatically correct the value

• The integer value will wrap around to the opposite extreme