Golang golang-pythagoras (snippet)

Go programming example 'golang-pythagoras'

golang-pythagoras

Golang beginners example: golang-pythagoras

package main

import (
    "fmt"
    "math"
    "os"
    "strconv"
)

func q(a float64) float64 {
    return a * a
}

func main() {
    if len(os.Args) == 4 {
        switch "?" {
        case os.Args[1]:
            b, _ := strconv.ParseFloat(os.Args[2], 0)
            c, _ := strconv.ParseFloat(os.Args[3], 0)
            fmt.Println(math.Sqrt(q(float64(c)) - q(float64(b))))
        case os.Args[2]:
            a, _ := strconv.ParseFloat(os.Args[1], 0)
            c, _ := strconv.ParseFloat(os.Args[3], 0)
            fmt.Println(math.Sqrt(q(float64(c)) - q(float64(a))))
        case os.Args[3]:
            a, _ := strconv.ParseFloat(os.Args[1], 0)
            b, _ := strconv.ParseFloat(os.Args[2], 0)
            fmt.Println(math.Sqrt(q(float64(a)) + q(float64(b))))
        default:
            fmt.Println("one of the arguments have to be a \"?\"")
        }
    } else {
        fmt.Println("this app needs 3 arguments")
    }
}

Useful links

• Learn Go: https://golangr.com
• Download Go: https://golang.org