tutorial2

Constants, Variables and Basic Data Types in Go

Constants

In Go, constants are declared like variables, but with the const keyword. Constants can be character, string, boolean, or numeric values. Constants cannot be declared using the := syntax.

const Pi = 3.14

Variables

Variables in Go are explicitly declared and used by the compiler to e.g. check type-correctness of function calls.

var x int = 1
y := 2 // Short variable declarations, infer the type based on the assigned value

Basic Data Types

Go's basic types are:

bool

string

int  int8  int16  int32  int64
uint uint8 uint16 uint32 uint64 uintptr

byte // alias for uint8

rune // alias for int32, represents a Unicode code point

float32 float64

complex64 complex128

The int, uint, and uintptr types are usually 32 bits wide on 32-bit systems and 64 bits wide on 64-bit systems.

Zero Values

Variables declared without an explicit initial value are given their zero value. The zero value is:

• 0 for numeric types,
• false for the boolean type, and
• "" (the empty string) for strings.

Checkout the code

• main.go