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
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+18.3k Golang : Check if os.Stdin input data is piped or from terminal
+8.9k Golang : Setting variable value with ldflags
+16.1k Golang : Find smallest number in array
+25.7k Golang : Find files by name - cross platform example
+7.9k Golang : Populate or initialize struct with values example
+12.7k Golang : How to pass map to html template and access the map's elements
+18.7k Golang : Accept input from user with fmt.Scanf skipped white spaces and how to fix it
+7.4k Golang : Count leading or ending zeros(any item of interest) example
+32.8k Golang : How to stream file to client(browser) or write to http.ResponseWriter?
+7.2k Golang : Check if integer is power of four example