Draw a circle without floating point arithmetic

Given a radius of a circle, draw the circle without using floating point arithmetic.

Following program uses a simple concept. Let the radius of the circle be r. Consider a square of size (2r+1)*(2r+1) around the circle to be drawn. Now walk through every point inside the square. For every every point (x,y), if (x, y) lies inside the circle (or x^2+ y^2 < r^2), then print it, otherwise print space.

CPP

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#include <stdio.h>
  
void drawCircle(int r)
{
    // Consider a rectangle of size N*N
    int N = 2*r+1;
  
    int x, y;  // Coordinates inside the rectangle
  
    // Draw a square of size N*N.
    for (int i = 0; i < N; i++)
    {
        for (int j = 0; j < N; j++)
        {
            // Start from the left most corner point
            x = i-r;
            y = j-r;
  
            // If this point is inside the circle, print it
            if (x*x + y*y <= r*r+1 )
                printf(".");
            else // If outside the circle, print space
                printf(" ");
            printf(" ");
        }
        printf("\n");
    }
}
  
// Driver Program to test above function
int  main()
{
    drawCircle(8);
    return 0;
}

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Java

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// Java code to demonstrate to draw
// circle without floating 
// point arithmetic
  
class GFG
{
static void drawCircle(int r)
{
    // Consider a rectangle of size N*N
    int N = 2*r+1;
  
    int x, y; // Coordinates inside the rectangle
  
    // Draw a square of size N*N.
    for (int i = 0; i < N; i++)
    {
        for (int j = 0; j < N; j++)
        {
            // Start from the left most corner point
            x = i-r;
            y = j-r;
  
            // If this point is inside the circle, print it
            if (x*x + y*y <= r*r+1 )
                System.out.print(".");
            else 
                // If outside the circle, print space
                System.out.print(" ");
  
            System.out.print(" ");
        }
  
        System.out.println();
    }
}
  
// Driver Program to test above function
public static void main(String arg[])
{
    drawCircle(8);
}
}
  
// This code is contributed
// by Anant Agarwal.

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