polar2cartesian.go

package main 

import (
	"bufio"
	"fmt"
	"math"
	"os"
	"runtime"
)

const result = "Polar radius=%.02f θ=%.02f° → Cartesian x=%.02f y=%.02f\n"

var prompt = "Enter a radius and an angle (in degrees), e.g., 12.5 90, " +
    "or %s to quit."

type polar struct {
	radius float64
	angle float64
}

type cartesian struct {
	x float64
	y float64
}

func init(){
	if runtime.GOOS == "windows" {
		prompt = fmt.Sprintf(prompt, "Ctrl+Z, Enter")
	} else {
		prompt = fmt.Sprintf(prompt, "Ctrl+D")
	}
}