42 lines
919 B
Go
42 lines
919 B
Go
// For more tutorials: https://blog.learngoprogramming.com
|
|
//
|
|
// Copyright © 2018 Inanc Gumus
|
|
// Learn Go Programming Course
|
|
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
|
|
//
|
|
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
)
|
|
|
|
// ---------------------------------------------------------
|
|
// EXERCISE
|
|
// 1. Get the radius from the command-line
|
|
// 2. Convert it to a float64
|
|
// 3. Calculate the surface area of a sphere
|
|
//
|
|
// SPHERE SURFACE AREA FORMULA
|
|
// area = 4πr²
|
|
// https://en.wikipedia.org/wiki/Sphere#Surface_area
|
|
//
|
|
// RESTRICTION
|
|
// Use `math.Pow` to calculate the area
|
|
// Read its documentation to see how it works.
|
|
// https://golang.org/pkg/math/#Pow
|
|
//
|
|
// EXPECTED OUTPUT
|
|
// 1256.64
|
|
// ---------------------------------------------------------
|
|
|
|
func main() {
|
|
var radius, area float64
|
|
|
|
// ADD YOUR CODE HERE
|
|
// ...
|
|
|
|
// DO NOT TOUCH THIS
|
|
fmt.Printf("radius: %g -> area: %.2f\n", radius, area)
|
|
}
|