# Why size of int is 2 or 4 bytes?

## Why size of int is 2 or 4 bytes?

So the reason why you are seeing an int as 4 bytes (32 bits), is because the code is compiled to be executed efficiently by a 32-bit CPU. If the same code were compiled for a 16-bit CPU the int may be 16 bits, and on a 64-bit CPU it may be 64 bits.

## What is a 2 byte integer?

2-byte signed Integer [the ~] noun A 2-byte signed integer can have a range from -32,768 to 32,767. The most significant bit is the sign bit, which is 1 for negative values and 0 for positive values. The storage size of the integer is 2 bytes. A 2-byte signed integer can have a range from -32,768 to 32,767.

How many bytes is an integer?

4 bytes
Windows 64-bit applications

Name Length
int 4 bytes
long 4 bytes
float 4 bytes
double 8 bytes

### Which data type takes 2 bytes?

Primitive Data Types

Data Type Size Description
byte 1 byte Stores whole numbers from -128 to 127
short 2 bytes Stores whole numbers from -32,768 to 32,767
int 4 bytes Stores whole numbers from -2,147,483,648 to 2,147,483,647
long 8 bytes Stores whole numbers from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807

### What is the size of long int?

Data Types and Sizes

Type Name 32–bit Size 64–bit Size
short 2 bytes 2 bytes
int 4 bytes 4 bytes
long 4 bytes 8 bytes
long long 8 bytes 8 bytes

Why are int and long the same size?

These days, on non-Windows platforms that have 64-bit processors, long is indeed 64 bits, where int is 32 bits. But the main point is that there is no GUARANTEE that the type is any particular size for long , other than a minimum of 32 bits. It is then up to the compiler if it’s larger than that or not.

#### What is long long int?

A long int is a signed integral type that is at least 32 bits, while a long long or long long int is a signed integral type is at least 64 bits. This doesn’t necessarily mean that a long long is wider than a long . Many platforms / ABIs use the LP64 model – where long (and pointers) are 64 bits wide.

#### What is the difference between long int and int?

The difference between int and long is that int is 32 bits in width while long is 64 bits in width.

What is a long int?

A long integer is a data type in computer science whose range is greater (sometimes even double) than that of the standard data type integer. Depending on the programming language and the computer machine processor, the size of the long integer will vary.

## Why is long same as int?

What is a long integer?

A long integer can represent a whole integer whose range is greater than or equal to that of a standard integer on the same machine. In C, it is denoted by long. It is required to be at least 32 bits, and may or may not be larger than a standard integer.

### How many bytes does an int have to be?

32-bit compilers also use 4 bytes as the size of an int. Actually the C language standard says that an int must be at least 16-bits wide. But it doesn’t say it has to be exactly n-bits wide.

### What is the difference between an integer and a long?

An Integer takes up half the memory that a Long does. Now, we are talking about 2 bytes, so it’s not going to make a real difference for individual integers, it’s only a concern when you are dealing with TONS of integers (e.g large arrays) and memory usage is critical.

How many bytes does an unsigned int variable occupy?

Thus we can see that unsigned int require (at least) 16 bits, which is where you get the two bytes (assuming CHAR_BIT is 8)… and later when that limit increased to 2³² – 1, people were stating 4 bytes instead. This explains the phenomena you’ve observed: Most of the textbooks say integer variables occupy 2 bytes.

#### Does an integer variable in C occupy more than 2 bytes?

For all integer types T1, T2, and T3, if T1 has greater rank than T2 and T2 has greater rank than T3, then T1 has greater rank than T3 Show activity on this post. Does an Integer variable in C occupy 2 bytes or 4 bytes? That depends on the platform you’re using, as well as how your compiler is configured.