30 days of code in Go: Day 7 - Arrays

Hi there! A couple days ago I wrote a post about a simple array sum in Go and I said I didn’t need an array in memory to do the sum, but just an integer that would store the inputs the user gave the program. This time, I will really need an array.

The goal is to read an array $A$ of $N$ elements and print $A$ elements in reverse order. Surely I could put everything in a file and then read it backwards, but as I don’t even know how to use files in Go at the moment, I will be creating an array in memory and then printing it backwards to the screen. My solution is just below.

package main

import (
  "fmt"
)

func main() {
  var N int
  fmt.Scan(&N)
  var a = make([]int, N)
  for j := 0; j < N; j++ {
   fmt.Scan(&a[j])
  }
  for i := len(a) - 1; i >= 0; i-- {
   fmt.Printf("%d ", a[i])
  }
  fmt.Printf("\n")
}

The main point that was different for me was the way an array is defined. You use []int instead of int[] like in C. I am not sure what was the purpose of that, maybe just to be different from C haha.

That’s all for today, thanks for reading! If you have any questions, complaints or suggestions, please comment!