从控制台接受一个字符并显示其下一个字符

Question

I want to write a program that accepts a character from console and display its next character.

This is what I tried:

package main

import (
    "fmt"
)

func main() {

    var ch int32
    fmt.Printf("Enter Char : ")
    fmt.Scan(&ch)

    ch++

    fmt.Printf("Next Char is %s ", string(ch))

}

Answer 1

"Characters" in Go are called runes, and rune is an alias for int32. You need two changes:

1. Scan with the proper verb (your Scan actually fails - check for errors!)
2. Print with the proper verb

Here's an extended example:

package main

import (
    "fmt"
    "log"
)

func main() {

    var ch rune
    fmt.Printf("Enter Char : ")
    _, err := fmt.Scanf("%c", &ch)
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("ch = %x
", ch)
    ch++
    fmt.Printf("ch+1 = %x
", ch)
    fmt.Printf("Next char is %c
", ch)
}

Sample session:

Enter Char : a
ch = 61
ch+1 = 62
Next char is b

Make sure to read this official Go blog post to better understand how runes and strings interact.