Go Integers

Internal

• Built-in Types

Overview

Integers are designated by the following pre-declared type identifiers.

In most cases, we simply declare an int and leave it to the compiler to allocate the right type of integer, depending on the underlying architecture.

• Unsigned integers: uint8 (or byte), uint16, uint32 (or rune), uint64.
• Signed integers: int8, int16, int32, int64.
• Machine-dependent integers: uint, int and uintptr. int for example can be 4 bytes or 8 bytes long, depending on the underlying architecture.

When a regular integer is needed in the program, int should be the default.

Uninitialized value: 0

byte

byte is unsigned int represented on a byte (uint8).

Indexing operator [] applied to strings return bytes.

Conversion between bytes and strings

A single byte can be converted to string as follows:

var b byte = 65 // decimal ASCII for "A"
str := string(b) // str is "A"

The following expression converts a string to a slice of bytes:

bytes := []byte("test")

The following expression converts a slice of bytes to string:

str := string(bytes)

Also see:

Conversion between Types

Integers as characters

i := 'A'
j := i + 1
fmt.Printf("%c %d\n", j, j)

Printf()

Integers to Strings

i := 0
string(48 + i)