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: Circle Area
//
// Calculate the area of a circle from the given radius
//
// CIRCLE AREA FORMULA
// area = πr²
// https://en.wikipedia.org/wiki/Area#Circles
//
// HINT
// For PI you can use `math.Pi`
//
// EXPECTED OUTPUT
// radius: 10 -> area: 314.1592653589793
//
// BONUS EXERCISE!
// 1. Print the area as 314.16
// 2. To do that you need to use the correct Printf verb :)
// Instead of `%g` verb below.
//
// EXPECTED OUTPUT
// radius: 10 -> area: 314.16
// ---------------------------------------------------------
func main() {
var (
radius = 10.
area float64
)
// ADD YOUR CODE HERE
// ...
// DO NOT TOUCH THIS
fmt.Printf("radius: %g -> area: %g\n", radius, area)
}
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