题解 | #统计字符#

package main

import (
	"bufio"
	"fmt"
	"os"
	"unicode"
)

func main() {
	reader := bufio.NewReader(os.Stdin)
	b, _, _ := reader.ReadLine()
	str := string(b)
	var letter, space, number, other int
	for _, s := range str {
		if unicode.IsLetter(s) {
			letter++
			continue
		}
		if unicode.IsSpace(s) {
			space++
			continue
		}
		if unicode.IsNumber(s) {
			number++
			continue
		}
		other++
	}
	fmt.Printf("%d\n%d\n%d\n%d", letter, space, number, other)
}