Draw Circle to Console (implementation with Golang)

main.go

package main

import (
	"bytes"
	"fmt"
	"math"
	"strings"
)

// α(radians) = α(degrees) × π / 180°
func DegToRad(deg float64) float64 {
	return deg * (math.Pi / 180)
}

// α(degrees) = α(radians) × 180° / π
func RadToDeg(rad float64) float64 {
	return rad * (180 / math.Pi)
}

func main() {
	fmt.Println(1*(math.Pi/180), " ", math.Cos(2*(math.Pi/180)))

	radius := 10

	n := 31

	circleDot := "*"
	canvasDot := "#"

	var plane bytes.Buffer
	var cartesian [][]string

	// draw cartesian plane fill with "#"
	for y := 0; y <= n; y++ {
		var cartI []string
		for x := 0; x <= n; x++ {
			cartI = append(cartI, canvasDot)
		}

		cartesian = append(cartesian, cartI)
	}

	// draw cirle
	var xx float64 = 0
	var yy float64 = 0
	for t := 0; t <= 360; t++ {
		fmt.Println(float64(t), " ", math.Cos(DegToRad(float64(t))), " ", math.Sin(DegToRad(float64(t))))
		yy = (float64(n) / 2) + math.Round(float64(radius)*math.Sin(DegToRad(float64(t))))
		xx = (float64(n) / 2) + math.Round(float64(radius)*math.Cos(DegToRad(float64(t))))

		cartesian[int(math.Abs(yy))][int(math.Abs(xx))] = circleDot

	}

	for i := 0; i < len(cartesian); i++ {
		ss := strings.Join(cartesian[i], "")

		plane.WriteString(ss)
		plane.WriteString("\n")
	}
	fmt.Print(plane.String())
}