使用Go语言统计文件中每个字母出现频率的方法

package main

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

func main() {
    filePath := "sample.txt"

    // 打开文件
    file, err := os.Open(filePath)
    if err != nil {
        fmt.Println("无法打开文件:", err)
        return
    }
    defer file.Close()

    // 用于存储每个字母出现的次数
    frequency := make(map[rune]int)
    totalLetters := 0

    scanner := bufio.NewScanner(file)
    for scanner.Scan() {
        line := scanner.Text()
        for _, ch := range line {
            if unicode.IsLetter(ch) {
                ch = unicode.ToLower(ch)
                frequency[ch]++
                totalLetters++
            }
        }
    }

    // 打印结果
    fmt.Println("字母频率统计：")
    for ch := 'a'; ch <= 'z'; ch++ {
        count := frequency[ch]
        if count > 0 {
            percentage := float64(count) / float64(totalLetters) * 100
            fmt.Printf("%c: %d (%.2f%%)\n", ch, count, percentage)
        }
    }
}

Go is expressive, concise, clean, and efficient.
Its concurrency mechanisms make it easy to write programs.

字母频率统计：
a: 5 (4.85%)
c: 7 (6.80%)
d: 2 (1.94%)
e: 10 (9.71%)
f: 2 (1.94%)
g: 1 (0.97%)
...
t: 8 (7.77%)
w: 1 (0.97%)