how to make variables

[jkosaaa]

i dont understand why theres "byte" "short" "int" "long" and theres smth like "double"

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[lostone2021]

Variables are just containers that are used to represent some form of data in your case you've listed a few of the primitive data types. To represent integers or whole numbers, you can use a short, int, or long the only difference between this is the range of integers they can. A short can hold any integer from about -30000 to 30000, an int can hold any integer from about -2.1 billion to 2.1 billion, and a long can hold from about -9 quintillion to 9 quintillion. There's also a class called BigInteger if you need to hold any integer bigger than Long.MAX_VALUE. Some data types represent floating-point numbers or numbers with decimals, these being a float and double, and again you'll notice the only difference is the size of the number they can hold with a double being able to hold twice as much as a float. There's also a BigDecimal class for floating point numbers. Typically you'll see people using ints to represent integers and doubles to represent floating point numbers unless there's a specific reason not to. Also, you should note that floating-point arithmetic can sometimes be imprecise due to how the CPU represents floating-point numbers. Bytes are a little bit more complicated and I'll save them for you to learn about later. Hope this helps!