encode/decode two ints in binary

main.go

package main

import "fmt"

func encodeBitmap(num1, num2 int) (int, error) {
	if !(0 <= num1 && num1 <= 10) || !(0 <= num2 && num2 <= 10) {
		return 0, fmt.Errorf("Input integers must be between 0 and 10")
	}

	// Using bitwise left shift to create a bitmap
	encodedValue := (num1 << 4) | num2
	return encodedValue, nil
}

func decodeBitmap(encodedValue int) (int, int) {
	// Extracting the original values using bitwise AND and right shift
	num2 := encodedValue & 0b1111
	num1 := (encodedValue >> 4) & 0b1111
	return num1, num2
}

func main() {
	// Example usage
	num1 := 0
	num2 := 10

	encoded, err := encodeBitmap(num1, num2)
	if err != nil {
		fmt.Println("Error:", err)
		return
	}

	decoded1, decoded2 := decodeBitmap(encoded)

	fmt.Printf("Original Numbers: num1=%d, num2=%d\n", num1, num2)
	fmt.Printf("Encoded Value: %b\n", encoded)
	fmt.Printf("Decoded Numbers: num1=%d, num2=%d\n", decoded1, decoded2)
}