The HackerRank challenge of today was a problem with conditionals. Given an integer $n$, the goal was to perform the following actions:

  • If $n$ is odd, print Weird
  • If $n$ is even and in the range $[2, 5]$, print Not Weird
  • If $n$ is even and in the range $[6, 20]$, print Weird
  • If $n$ is even and greater than $20$, print Weird

The input to the program is simply the number $n$ and the result is a single line saying that the number is weird or not. My solution was

package main

import "fmt"

func main() {
  // read input
  n := 0
  fmt.Scanf("%v\n", &n)

  var answer string
  // Notice bitwise operation ->
  // no division to check
  if n&1 != 0 {
   answer = "Weird"
  } else {
   if (n >= 2 && n <= 5) || n > 20 {
    answer = "Not Weird"
   } else {
    answer = "Weird"


There is a disclaimer though: I initially used n % 2 == 1 but this does an integer division and when I saw that I could just use a bitwise operation to check if the number was odd or not, I changed it.

That’s all for this post. Thanks for reading!