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
+11.7k Golang : Calculations using complex numbers example
+24.6k Golang : How to validate URL the right way
+16.5k Golang : Convert slice to array
+23k Golang : Calculate time different
+13.9k Golang : convert(cast) string to float value
+10.2k Golang : Compare files modify date example
+7.3k Golang : How to iterate a slice without using for loop?
+9.3k Golang : How to check if a string with spaces in between is numeric?
+15k Golang : How to check for empty array string or string?
+6.1k PageSpeed : Clear or flush cache on web server
+6.4k Unix/Linux : Use netstat to find out IP addresses served by your website server
+14.6k Golang : Missing Bazaar command