Step by Step solution about How to resolve the algorithm Old Russian measure of length step by step in the Go programming language

The provided Go program is a basic unit converter that allows users to convert values between different units of measurement. Here's a detailed explanation of the code:

1. Package and Imports:

   • The program is in a package called main, indicating that it's the entry point for the application.
   • It imports several standard Go libraries:
     • bufio: For reading user input from the standard input.
     • fmt: For formatting and printing output.
     • os: For interacting with the operating system.
     • strconv: For converting strings to numeric types.
     • strings: For manipulating strings.

2. Measurement Units and Conversion Factors:

   • Two slices, units and convs, are defined to represent the various units of measurement and their corresponding conversion factors, respectively.
   • units contains the names of the units in a specific order, while convs stores the conversion factors to convert from the selected unit to the other units.

3. Input Processing Loop:

   • The program enters an infinite loop to repeatedly prompt the user for input and perform unit conversions.
   • Inside the loop:
     • It prints the list of available units to choose from, along with their corresponding numbers.
     • It prompts the user to choose a unit by entering a number from 1 to 13.
     • It validates the user's input to ensure it's within the valid range and prompts for input again if invalid.
     • It decrements the unit number by 1 to match the index in the units and convs slices.
     • It prompts the user to enter a value in the chosen unit.
     • It validates the user's input to ensure it's a non-negative number and prompts for input again if invalid.

4. Unit Conversion and Output:

   • Once the user has provided valid input, the program calculates the equivalent values in all the other units.
   • It iterates through the units slice, excluding the selected unit, and calculates the equivalent value using the conversion factors.
   • It prints the equivalent values in a formatted table.

5. User Prompt for Another Conversion:

   • After displaying the conversion results, the program prompts the user if they want to perform another conversion.
   • It reads input from the user and validates it to ensure it's either "y" (yes) or "n" (no), prompting for input again if invalid.
   • If the user enters "n," the program exits.

In summary, this Go program provides an easy-to-use interactive unit converter that allows users to convert values between different units of measurement. It handles input validation and displays the conversion results in a clear table format.

package main

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

func main() {
    units := []string{
        "tochka", "liniya", "dyuim", "vershok", "piad", "fut",
        "arshin", "sazhen", "versta", "milia",
        "centimeter", "meter", "kilometer",
    }

    convs := []float32{
        0.0254, 0.254, 2.54, 4.445, 17.78, 30.48,
        71.12, 213.36, 10668, 74676,
        1, 100, 10000,
    }

    scanner := bufio.NewScanner(os.Stdin)
    for {
        for i, u := range units {
            fmt.Printf("%2d %s\n", i+1, u)
        }
        fmt.Println()
        var unit int
        var err error
        for {
            fmt.Print("Please choose a unit 1 to 13 : ")
            scanner.Scan()
            unit, err = strconv.Atoi(scanner.Text())
            if err == nil && unit >= 1 && unit <= 13 {
                break
            }
        }
        unit--
        var value float64
        for {
            fmt.Print("Now enter a value in that unit : ")
            scanner.Scan()
            value, err = strconv.ParseFloat(scanner.Text(), 32)
            if err == nil && value >= 0 {
                break
            }
        }
        fmt.Println("\nThe equivalent in the remaining units is:\n")
        for i, u := range units {
            if i == unit {
                continue
            }
            fmt.Printf(" %10s : %g\n", u, float32(value)*convs[unit]/convs[i])
        }
        fmt.Println()
        yn := ""
        for yn != "y" && yn != "n" {
            fmt.Print("Do another one y/n : ")
            scanner.Scan()
            yn = strings.ToLower(scanner.Text())
        }
        if yn == "n" {
            return
        }
    }
}