GoLangRequirement.go

package main

import (
    "bufio"
    "fmt"
    "log"
    "os"
    "strings"
)

func reverseLine (line string) string {
	words := strings.Fields(line)

	for i, j := 0, len(words) -1; i < j; i, j = i+1, j-1 {
		words[i], words[j] = words[j], words[i] 
	}

	return strings.Join(words, " ")
}

func reverseFile (filePath string) int {
	var numLines int = 0
	file, err := os.Open(filePath)
	
	if err != nil {
		log.Fatal(err)
	}
	defer file.Close() // Wait till all functions in this scope finish
	
	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		line := scanner.Text()
		numLines += 1
		fmt.Println(reverseLine(line)) // Print the reversed line
	}

	if err := scanner.Err(); err != nil {
		log.Fatal(err)
	}

	return numLines
}

func main() {
	reader := bufio.NewReader(os.Stdin)
	fmt.Println("Enter the file name with the extension")
	
	linePath, _ := reader.ReadString('\n')
	linePath = strings.Replace(linePath, "\n", "", -1) // convert CRLF to LF

	var numLines = reverseFile(linePath)

	fmt.Println("The number of lines is ", numLines)
}