The size of an int in Java is completely independent of the 32-bitness or 64-bitness of a JDK. It is always 4 bytes = 32 bits = −2,147,483,648 to 2,147,483,647. If you want a 64-bit integer, use a long , which is always 64 bits = 8 bytes. For int, from -2147483648 to 2147483647, inclusive.

## Is Java int 32 or 64-bit?

**int**: By default, the **int** data type is a **32**–**bit** signed two’s complement integer, which has a minimum value of -2^{31} and a maximum value of 2^{31}-1. … In **Java** SE 8 and later, you can use the long data type to represent an unsigned **64**–**bit** long, which has a minimum value of 0 and a maximum value of 2** ^{64}**-1.

## Can int be 64 bits?

int is 32 bits in size. long , ptr , and off_t are all 64 bits (**8 bytes**) in size.

## Is long 64-bit Java?

Yes. A **Java long** is **64 bits** on any JVM, without exception. All the **Java** primitive types are completely portable and have fixed sizes across all implementations. The primitive types are always the same size.

## Is unsigned int 64-bit?

64-bit unsigned integer type is used to **store only pozitiv whole number**. 64-bit unsigned integer and his value range: from 0 to 18446744073709551615.

## How many numbers can int hold?

The INTEGER data type stores whole numbers that range from **-2,147,483,647 to 2,147,483,647 for 9 or 10 digits of precision**. The number 2,147,483,648 is a reserved value and cannot be used. The INTEGER value is stored as a signed binary integer and is typically used to store counts, quantities, and so on.

## Why int is 2 or 4 bytes?

The size of an int is really compiler dependent. Back in the day, when processors were 16 bit, an int was 2 bytes. Nowadays, it’s most often 4 **bytes** on a 32-bit as well as 64-bit systems. Still, using sizeof(int) is the best way to get the size of an integer for the specific system the program is executed on.

## Why is long 4 bytes?

The C++ Language Specification simply states that **the size of a long must be at least the size of an int** . It used to be standard to have int = 2 bytes and long = 4 bytes. For some reason int grew up and long stayed the same (on Windows compilers at least).

## Is Double always 64-bit?

Floating-point constants may be used to initialize data structures, but floating-point arithmetic is not permitted in D.

…

Table 2-4 D Floating-Point Data Types.

Type Name | 32–bit Size | 64–bit Size |
---|---|---|

double | 8 bytes | 8 bytes |

long double | 16 bytes | 16 bytes |

## What is the 64-bit integer limit?

The maximum (unsigned) 64-bit integer is **18446744073709551615** . This is (2^64)-1, which is essentially the square of (2^32)-1, which is “about” 4 billion. In general, you can estimate that every 10 bits represents 3 decimal digits.

## What is double in Java?

The Java double keyword is a primitive data type. It is a double-precision 64-bit IEEE 754 floating point. It is used to declare the variables and methods. It generally **represents the decimal numbers**.