Go Diamond

gistfile1.go

package main

import "fmt"

func space(ch rune, end rune) (side int, in int) {
	if ch == 'A' {
		in = 0
	} else {
		in = int((ch-'A')*2 - 1)
	}

	side = int(end - ch)
	return
}

func main() {
	var ch rune
	fmt.Print("Enter Letter : ")
	fmt.Scanf("%c", &ch)

	for s := 'A'; s <= ch; s++ {
		sidesp, insp := space(s, ch)
		for i := 1; i <= sidesp; i++ {
			fmt.Print(" ")
		}
		fmt.Printf("%c", s)
		if insp == 0 {
			fmt.Println()
			continue
		}
		for i := 1; i <= insp; i++ {
			fmt.Print(" ")
		}
		fmt.Printf("%c\n", s)
	}

	for s := ch - 1; s >= 'A'; s-- {
		sidesp, insp := space(s, ch)
		for i := 1; i <= sidesp; i++ {
			fmt.Print(" ")
		}
		fmt.Printf("%c", s)
		if insp == 0 {
			fmt.Println()
			continue
		}
		for i := 1; i <= insp; i++ {
			fmt.Print(" ")
		}
		fmt.Printf("%c\n", s)
	}
	fmt.Scanln()
}