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"
"math"
)
func main() {
var (
radius = 10.
area float64
)
area = math.Pi * radius * radius
fmt.Printf("radius: %g -> area: %.2f\n",
radius, area)
// ALTERNATIVE:
// math.Pow calculates the power of a float number
// area = math.Pi * math.Pow(radius, 2)
}
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