What is double and float values in Java and What makes it different from int and float type ?

basically I want to know about the double and long type in Java how does they work and and when to use them instead of int and float .

CodePudding user response：

int is 4 bytes, long is 8 bytes. The range of possible numbers is bigger from long to int.

Same goes for double and float, but with decimals.

See MIN_VALUE and MAX_VALUE field on the wrapper classes java.lang.Integer, java.lang.Long, java.lang.Float and java.lang.Double.

CodePudding user response：

Java has various data types. Data types are divided into primitive and reference. Primitive data types can be whole-number, decimal, char, etc. double and float are decimal data types. So they store decimal numbers.
The difference between double and float is that float is slightly more precise, it has a precision of 7 numbers. double is more accurate because it has a precision of 15 - 16 numbers.

Whole-number data types include byte, short, int and long. a byte is the smallest, ranging from -128 to 127, but takes up only 8 bits. It is therefore appropriate to use it, for example, to store age. short has a range of -32,768 to 32,767 and is 16 bits long. int is the most used, has a range of -2,147,483,648 to 2,147,483,647, and occupies 32 bits. A long has the range -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 and occupies 64 bits.