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package main

import (
    //  "bufio"
    "fmt"
    "math"

    //  "os"
    "strconv"
    //  "errors"
)

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

    fmt.Println(phrase)
    fmt.Println("Please select a radius for a circle")
    var rad float64
    var err error
    _, err = fmt.Scanf("%rad", &rad)
    if err != nil {
        fmt.Println("Scan error", err)
    }
    circlearea(rad)

}

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