如何在golang中使用空格距离输入

Question

I wanted to take some input from user based on white space in golang. The current code is...

fmt.Scanf("%d\n", &N)
var a [10]int
for n := 0; n < N; n++ {
    fmt.Scanf("%d\n", &a[n])
}

This code will let me take input in terminal like...

5
1
2
3
4
5

So, a[] = {1,2,3,4,5} But I would like to take input in terminal like...

5
1 2 3 4 5

So, a[] = {1,2,3,4,5} So please help to find what should I change in the for-loop above.

Answer 1

You can try something like this. This will read in the first number which is the size of the array you want to create, then the next line will be the items of length (n) in the array

import (
    "bufio"
    "fmt"
    "io"
    "os"
    "strconv"
    "strings"
)

func main() {
  reader := bufio.NewReaderSize(os.Stdin, 1024 * 1024)

  nTemp, err := strconv.ParseInt(readLine(reader), 10, 64)
  checkError(err)
  n := int32(nTemp)

  arrTemp := strings.Split(readLine(reader), " ")

  var arr []int32

  for i := 0; i < int(n); i++ {
      arrItemTemp, err := strconv.ParseInt(arrTemp[i], 10, 64)
      checkError(err)
      arrItem := int32(arrItemTemp)
      arr = append(arr, arrItem)
  }

  fmt.Printf("%#v, arr", arr)
}

So when I try with your given input eg:

5
1 2 3 4 5

// I get the following:
[]int32{1, 2, 3, 4, 5}, arr

The question you have asked seems to be common in sites like Hackerrank in any of the featured questions.

Answer 2

Thank you martinomburajr & Casey Flynn.

I went through your answers and I did my own trial-and-error. And finally found the somultion.

var N int
fmt.Scanf("%d\n", &N)
a := make([]int, N)
for n := range a {
    fmt.Scanf("%d", &a[n])
}
fmt.Scanf("\n")

And it is working fine for my requirement. Thank you so much for the help.