main.go 源码
// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials : https://learngoprogramming.com
// In-person training : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus
package main
import (
"fmt"
)
// ---------------------------------------------------------
// EXERCISE: Sphere Area
//
// 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
// go run main.go 10
// 1256.64
//
// go run main.go 54.2
// 36915.47
// ---------------------------------------------------------
func main() {
var radius, area float64
// ADD YOUR CODE HERE
// ...
// DO NOT TOUCH THIS
fmt.Printf("radius: %g -> area: %.2f\n", radius, area)
}
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