Golang : Quadratic example

Here is a simple tutorial on how to perform quadratic calculation with Golang. This program accepts two floating point values from the command line and calculate the roots using quadratic formula. It also checks for the input values to see if they are floats or not.

Here you go!

 package main

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

 func main() {
 b, err := strconv.ParseFloat(os.Args[1], 10)

 if err != nil {
 fmt.Println("First input parameter must be of type float")
 os.Exit(1)
 }

 c, err := strconv.ParseFloat(os.Args[2], 10)

 if err != nil {
 fmt.Println("Second input parameter must be of type float")
 os.Exit(1)
 }

 fmt.Println("b : ", b)
 fmt.Println("c : ", c)

 // calculate the roots of the polynomial
 // x^2 + bx + c using the quadratic formula

 discriminant := b*b - 4.0*c
 d := math.Sqrt(discriminant)

 fmt.Printf("%0.6f\n", ((-b + d) / 2.0))
 fmt.Printf("%0.6f\n", ((-b - d) / 2.0))

 }

Sample output:

$./quadratic -1.0 -1.0

b : -1

c : -1

1.618034

-0.618034

$ ./quadratic -3.0 2.0

b : -3

c : 2

2.000000

1.000000

References:

https://www.socketloop.com/references/golang-strconv-parsefloat-function-example

https://www.socketloop.com/tutorials/golang-how-to-check-if-input-from-os-args-is-integer

https://www.socketloop.com/tutorials/golang-get-command-line-arguments