Golang : Read integer from file into array

This tutorial will demonstrate how to read a file with integer values into array. Let say nums.txt is a file with integer values of :

100

101

102

103

104

105

106

107

108

This code below will read the integer line by line and store the values into array.

 package main

 import (
 "fmt"
 "io"
 "os"
 )

 func main() {
 file, err := os.Open("nums.txt")

 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 var perline int
 var nums []int

 for {

 _, err := fmt.Fscanf(file, "%d\n", &perline) // give a patter to scan

 if err != nil {

 if err == io.EOF {
 break // stop reading the file
 }
 fmt.Println(err)
 os.Exit(1)
 }

 nums = append(nums, perline)
 }

 // print out the nums array content

 fmt.Println(nums)
 }

Output :

[100 101 102 103 104 105 106 107 108]

Hope that this simple tutorial can be useful to you.