Draw a circle in c# console

Armando Quiroga

Hi my question is how can i draw a circle in C# console app like this

****
*****
*****
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im noob in c# console and drawing i always use windows form app but this is only to learn new things of c# not only school class thanks for your help

4 Replies

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Vulpes12y ago
Accepted answer
I found something here on SO which might help:

http://stackoverflow.com/questions/24356723/how-to-draw-a-circle-with-asterisk-function-in-ruby

I've translated that to C# and added some code to (optionally) fill the circle with asterisks and the results are quite good:

using System;

class Circle
{
static void Main()
{
Console.Clear();

double r;

do
{
Console.Write("Enter radius of circle : ");
if(!double.TryParse(Console.ReadLine(), out r) || r <= 0)
{
Console.WriteLine("Invalid radius, try again");
}
}
while(r <= 0);

Console.WriteLine();
bool fill = false;
string input;

do
{
Console.Write("Do you want to fill the circle y/n : ");
input = Console.ReadLine().ToLower();
if (input != "y" && input != "n")
{
Console.WriteLine("Invalid reply, try again");
}
else if (input == "y")
{
fill = true;
}
}
while(input != "y" && input != "n");

Console.WriteLine();

double r_in = r - 0.4;
double r_out = r + 0.4;

for(double y = r; y >= -r; --y)
{
for(double x = -r; x < r_out; x += 0.5)
{
double value = x * x + y * y;
if(value >= r_in * r_in && value <= r_out * r_out)
{
Console.Write("*");
}
else if (fill && value < r_in * r_in && value < r_out * r_out)
{
Console.Write("*");
}
else
{
Console.Write(" ");
}
}

Console.WriteLine();
}

Console.ReadKey();
}
}
Yash Arora9y ago
static void circle(char c, int x)
{
int i, j;
int N = x;
for (i = 1; i <= N; i++)
{
for (j = 1; j <= N; j++)
{
//Print corner elements
if ((i == 1 || i == N) && (j == 1 || j == N))
{
Console.Write(" ");
}
else if (i == 1 || i == N || j == 1 || j == N)
{
//Print edges
Console.Write(c);
}
else
{
//Print center
Console.Write(" ");
}
}

Console.Write("\n");
}
Armando Quiroga12y ago
tnx 4 the answer but i was trying something like this to get the circle

using System;
using System.Collections.Generic;
using System.Text;

namespace PiramideAsteriscos
{
class Program
{
static void Main(string[] args)
{

Console.WriteLine("Programa que crea una pirámide de asteriscos");
inicio:
Console.WriteLine("inserta en número el nivel de la pirámide, mayor a cero");
try
{
int nivel = int.Parse(Console.ReadLine());
if (nivel != 0)
{

int a;
int espacios;
for (int i = 1; i <= nivel; i++)
{
StringBuilder final = new StringBuilder();

espacios = nivel - i;
a = i + (i - 1);
for (int i1 = 0; i1 < espacios; i1++)
final.Append(" ");

for (int i2 = 0; i2 < a; i2++)
final.Append("*");

Console.WriteLine(final.ToString());

}
}
else
{
System.Console.Clear();
goto inicio;
}

}
catch (Exception)
{
System.Console.Clear();
Console.WriteLine("El programa solo acepta números enteros");
goto inicio;

}
Console.WriteLine("" + "\n" + "Aprieta una tecla para salir");
Console.ReadLine();
}
}
}
Vulpes12y ago
Well, as it doesn't look much like a circle to me and it's not clear how you'd generalize it to draw larger 'circles', you might as well as just write it directly to the console and not bother tryiing to do it using loops as you would with diamonds, pyramids, squares etc:

using System;

class Circle
{
static void Main()
{
Console.WriteLine(" * * * *\n");
Console.WriteLine("* * * * *\n");
Console.WriteLine("* * * * *\n");
Console.WriteLine(" * * * *\n");
Console.ReadKey();
}
}