Golang : Read integer from file into array



Tags : golang read-file 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.

Affiliate :

Hire Golang Developers


  See also : Golang : Convert file content into array of bytes



Tags : golang read-file array

By Adam Ng

IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.


Advertisement