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Golang iota Constant with Examples

Golang | iota Constant: Here, we are going to learn about the iota constant with examples.
Submitted by IncludeHelp, on October 12, 2021 [Last updated : March 15, 2023]

iota Constant

In the Go programming language, iota is an untyped int type of value that is a predeclared identifier (represents the untyped integer ordinal number of the current const specification in a (usually parenthesized) const declaration). It is zero-indexed.

Syntax

iota

Parameter(s)

• None

Return Value

None

Example 1

// Golang program to demonstrate the
// example of iota constant

package main

import (
	"fmt"
)

func main() {
	const x = iota

	// Printing the value and type
	// of x
	fmt.Printf("x: %T, %v\n", x, x)

	// Declaring multiple constants
	const (
		a = iota
		b = iota
		c = iota
	)

	// Printing the values and types
	// of a, b, and c
	fmt.Printf("a: %T, %v\n", a, a)
	fmt.Printf("b: %T, %v\n", b, b)
	fmt.Printf("c: %T, %v\n", c, c)
}

Output

x: int, 0
a: int, 0
b: int, 1
c: int, 2

Example 2

// Golang program to demonstrate the
// example of iota constant

package main

import (
	"fmt"
)

func main() {
	// Declaring multiple constants
	const (
		a = iota
		b
		c
	)

	const (
		x = iota + 10
		y
		z
	)

	// Printing the values and types
	// of a, b, and c
	fmt.Printf("a: %T, %v\n", a, a)
	fmt.Printf("b: %T, %v\n", b, b)
	fmt.Printf("c: %T, %v\n", c, c)

	// Printing the values and types
	// of x, y, and z
	fmt.Printf("x: %T, %v\n", x, x)
	fmt.Printf("y: %T, %v\n", y, y)
	fmt.Printf("z: %T, %v\n", z, z)
}

Output

a: int, 0
b: int, 1
c: int, 2
x: int, 10
y: int, 11
z: int, 12

Golang builtin Package »

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