How Can I Read Integer Input from Standard Input in Go?

Getting Integer Input from Standard Input

Reading integer values from standard input is a common requirement in programming. In Go, the fmt.Scanf function provides a convenient way to retrieve numeric input.

Using fmt.Scanf

To use fmt.Scanf, first declare a variable of the desired type (e.g., var i int). Then, call fmt.Scanf with the following syntax:

fmt.Scanf("%d", &i)

Here, "%d" specifies the format specifier for integers. The & character before i is the memory address operator, which allows fmt.Scanf to modify the value of i.

Alternative Methods

If fmt.Scanf is not suitable, other options include:

1. bufio.Scanner: The bufio.Scanner type provides line-by-line input reading. You can use scanner.Int() to parse an integer from the current line.
2. strconv.ParseInt: This function takes a string as input and converts it to an integer. You can read the input string using bufio.Scanner or other methods.

Example Usage

The following code demonstrates how to read an integer using fmt.Scanf:

package main

import (
    "fmt"
)

func main() {
    var input int
    fmt.Scanf("%d", &input)
    fmt.Println("Input:", input)
}

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