DAS_2024_1/bazunov_andrew_lab_2/SecondService/main.go

package main

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

//Ищет наименьшее число из файла /var/data/data.txt и сохраняет его третью степень в /var/result/result.txt.

const INPUT = "/var/data/data.txt"
const OUTPUT = "/var/result/result.txt"

func ReadlinesFromFile(filename string) ([]string, error) {
	file, err := os.Open(filename)
	if err != nil {
		return nil, err
	}

	var output []string
	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		output = append(output, scanner.Text())
	}

	err = file.Close()
	if err != nil {
		return nil, err
	}

	return output, nil
}

func WriteIntToFile(filename string, i int) error {
	file, err := os.Create(filename)
	if err != nil {
		return err
	}

	defer func(file *os.File) {
		err := file.Close()
		if err != nil {

		}
	}(file)

	_, err = file.WriteString(fmt.Sprintf("%d\n", i))
	if err != nil {
		return err
	}
	return nil
}

func main() {
	lines, err := ReadlinesFromFile(INPUT)
	if err != nil {
		fmt.Println(err)
	}

	minValue := 0

	for _, line := range lines {
		if intValue, err := fmt.Sscanf(line, "%d", &minValue); err != nil {
			fmt.Println(err)
		} else {
			if minValue >= intValue {
				minValue = intValue
			}
		}
	}

	if err = WriteIntToFile(OUTPUT, minValue); err != nil {
		return
	} else {
		fmt.Printf("Write %d to %s\n", minValue, OUTPUT)
	}

	fmt.Println("Second Service is end.")
}