How to Read an Integer from Standard Input in Go?

Reading an Integer from Standard Input in Go

Question:

How can you utilize the fmt.Scanf function to retrieve an integer input from the standard input in Go? If this feature is not supported by fmt.Scanf, provide an alternative method for effectively reading a single integer.

Answer:

The official Go documentation provides comprehensive information on the fmt.Scanf function, located at http://golang.org/pkg/fmt/#Scanf. The fmt.Scanf function allows you to read formatted input from the standard input. In this case, you can use the fmt.Scanf function to read an integer by providing a format string %d. The syntax for reading an integer using fmt.Scanf is:

_, err := fmt.Scanf("%d", &variable_to_store_input)

Here's an example of reading an integer using fmt.Scanf:

func main() {
    var i int
    _, err := fmt.Scanf("%d", &i)
}

If you prefer an alternative method for reading a single integer, you can use the following approach:

1. Import the bufio package:

   import "bufio"

2. Create a bufio.Scanner instance:

   scanner := bufio.NewScanner(os.Stdin)

3. Read the input using the Next() method:

   scanner.Scan()

4. Retrieve the input as an integer using the Int() method:

   input, _ := strconv.Atoi(scanner.Text())

This method allows you to read a single integer from the standard input using the bufio package.

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