Help me draw a circle pattern using * symbol in java or python

Question

Here is the code but the circle is not as good as it should be.

public static void main(String[] args) {

int P; // For Creating A Square
int x, y;// Coordinates Of Square
int r;//Radius Of Circle
int c;//Every Single Point Of Circle (Equation If Circle)

Scanner sc = new Scanner(System.in);
System.out.print("Enter Radius Of Circle : ");
r = sc.nextInt();

// Crate A Circle Of P*P
P = 2*r;

// Draw A Square Of Size P*P.

for (int i = 0; i <= P; i++){

for (int j = 0; j <= P; j++){

// Start From The Left Corner Of Circle
x = r-i;
y = r-j;

c = x*x + y*y ;

//If Point (x,y) Is Inside The Circle
if (c <= r*r+1 ) {
System.out.print("* ");
}
else {
// If (x,y) Is Outside Of Circle
System.out.print(" ");
}

}

System.out.println();//Jump In A New Line
}

}

Answer 1

What do you want to improve? Is it looking elliptical? Is it not dark enough?

I made a few adjustments below to make it look more circular(same height/width) as tested in Sololearn's Code Playground and added the fontAspectRatio final variable/constant. It also looks darker because '*' is used for every character instead of having spaces between each.

public static void main(String[] args) {

int P; // For Creating A Square
int x, y;// Coordinates Of Square
int r;//Radius Of Circle
double c;//Every Single Point Of Circle (Equation If Circle)

Scanner sc = new Scanner(System.in);
System.out.print("Enter Radius Of Circle : ");
r = sc.nextInt();
System.out.println(); // make sure the circle starts on a new line.

// Crate A Circle Of P*P
P = 2*r;

final double fontAspectRatio = 1.62868;
// Adjust the fontAspectRatio if you see your circle looking a bit elliptical.

// Draw A Square Of Size P*P.

for (int i = 0; i <= P; i++){
for (int j = 0; j <= P; j++){

// Start From The Left Corner Of Circle
x = r-i;
y = r-j;

c = x*x*fontAspectRatio*fontAspectRatio + y*y ;
char ch;

//If Point (x,y) Is Inside The Circle
if (c <= r*r ) {
ch='*';
}
else {
// If (x,y) Is Outside Of Circle
ch = ' ';
}
System.out.print(ch);
}
System.out.println();//Jump In A New Line
}
}