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package main

import (
    "bufio"
    "fmt"
    "math"
    "os"
    "strconv"
    "strings"
    //  "errors"
)

func main() {
    phrase := "Counting the circles..." //string

    fmt.Println(phrase)
    fmt.Println("Please select a radius for a circle")
    reader := bufio.NewReader(os.Stdin)
    rad, _ := reader.ReadString('\n')
    rad = strings.Replace(rad, "\n", "", -1)
    numrad, e := strconv.ParseFloat(rad, 64)
    if e != nil {
        fmt.Println("Conversion error", rad)
    }
    circlearea(numrad)

}

func circlearea(p float64) {
    area := (math.Pow(p, 2)) * math.Pi
    var printable string = strconv.FormatFloat(area, 'f', 6, 64)
    fmt.Println(printable)
}