How do you represent a number as a letter in Golang?

Alphabetic Representation of a Number in Golang

Introduction:

Converting a number to its corresponding alphabetic representation can be a useful task in various scenarios. This article explores multiple ways to perform this conversion efficiently in the Go programming language.

Number to Rune (Character):

The simplest approach is to add the number to the ASCII value of 'A' minus 1. This will give you the rune corresponding to the alphabetic character. For example, adding 1 to 'A' - 1 yields 'A', adding 2 yields 'B', and so on.

Sample Code:

<code class="go">import "fmt"

func toChar(i int) rune {
    return rune('A' - 1 + i)
}

func main() {
    fmt.Printf("%d %q\n", 1, toChar(1))
    fmt.Printf("%d %q\n", 2, toChar(2))
    fmt.Printf("%d %q\n", 23, toChar(23))
}</code>

Number to String:

If a string representation is required, simply convert the rune returned by the previous method to a string.

Sample Code:

<code class="go">import "fmt"

func toCharStr(i int) string {
    return string('A' - 1 + i)
}

func main() {
    fmt.Printf("%d %q\n", 1, toCharStr(1))
    fmt.Printf("%d %q\n", 2, toCharStr(2))
    fmt.Printf("%d %q\n", 23, toCharStr(23))
}</code>

Number to String (Cached):

If the conversion needs to be performed frequently, it can be more efficient to cache the strings. This can be done by storing an array of all the alphabetic characters.

Sample Code:

<code class="go">import "fmt"

var arr = [...]string{"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
    "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"}

func toCharStrArr(i int) string {
    return arr[i-1]
}

func main() {
    fmt.Printf("%d %q\n", 1, toCharStrArr(1))
    fmt.Printf("%d %q\n", 2, toCharStrArr(2))
    fmt.Printf("%d %q\n", 23, toCharStrArr(23))
}</code>

Number to String (Slicing String Constant):

Another interesting solution involves slicing a constant string to get the desired character.

Sample Code:

<code class="go">import "fmt"

const abc = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

func toCharStrConst(i int) string {
    return abc[i-1 : i]
}

func main() {
    fmt.Printf("%d %q\n", 1, toCharStrConst(1))
    fmt.Printf("%d %q\n", 2, toCharStrConst(2))
    fmt.Printf("%d %q\n", 23, toCharStrConst(23))
}</code>

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