Bitmask example

bit_mask.go

package main

import "fmt"

func main() {
	//arr := []int{1, 2, 3, 4}
	arr := []string{"A", "B", "C", "D"}
	n := len(arr)

	for mask := 0; mask < (1 << n); mask++ {
		fmt.Println("n =", n, "(1 << n) = ", (1 << n), " mask = ", mask)
		for i := 0; i < n; i++ {
			a := 1 << i
			b := mask & a
			fmt.Print(" i = ", i, " a = ", (1 << i), " b = ", (mask & a))
			if b == 0 {
				fmt.Print(" arr[i] = ", arr[i])
			}
			fmt.Print("\n")
		}
		fmt.Println("")
	}
}