Java Program to Print Hollow Circle Character Pattern

by

Program to Print Hollow Circle Character Pattern

In the previous article, we have discussed Java Program to Print Circle Character Pattern

In this article we are going to see how to print the hollow circle character pattern.

Example-1

 When radius value = 5

   DEFGH   
  C         I  
 B            J 
A             K
A             K
A             K
A             K
A             K
 B            J 
  C          I  
   DEFGH
Example-2

When radius value = 9

           GHIJKLM      
       EFG         MNO    
    DE                    OP   
   C                          Q  
  BC                         QR 
  B                               R 
AB                               RS
A                                   S
A                                   S
A                                   S
A                                   S
A                                   S
AB                               RS
   B                              R 
   BC                         QR 
     C                         Q  
      DE                    OP   
         EFG         MNO    
             GHIJKLM

If you are new to Java and want to learn the java coding skills too fast. Try practicing the core java programs with the help of the Java basic programs list available.

Approach:

  • Enter the radius of the circle to print and store it in an integer variable radius.
  • Take first for loop to print all rows.
  • Take inner for loop to print column values and one to print empty spaces.
  • Then go on printing the character according to the iteration.

Java Code to Print Hollow Circle Character Pattern

import java.util.Scanner;
class Main
{
    public static void main(String[] args)  
    {  
        Scanner scan = new Scanner(System.in);
        System.out.print("Radius : ");
        //Taking radius of the circle as input from user
        int radius = scan.nextInt();
        int r, c; 
        double d;
        // starting ASCII value taken 65
        int ascii=65;
        for( r=0;r<=2 * radius; r++)
        {//Outer loop
            for(c=0; c<=2*radius; c++)
            {//Inner loop
                d = Math.sqrt((r-radius) * (r-radius)
                + (c-radius) * (c-radius));//Logic Part
                if(d > radius-0.5 && d < radius+0.5)
                //Print character or whitespace
                    System.out.print((char)(c+ascii));
                else
                    System.out.print(" ");
            }
            System.out.println();    
            //Prints a newline
        }
        
    }
}
Output:

Radius :  5
   DEFGH   
  C          I   
 B            J 
A             K
A             K
A             K
A             K
A             K
 B            J 
  C          I  
   DEFGH

C  Code to Print Hollow Circle Character Pattern

#include <stdio.h>
#include <math.h>
int main(int argc, char const *argv[])
{
    printf("Radius : ");
    //Taking radius as input from user
    int radius, r, c;
    // starting ASCII value taken 65
    int ascii=65;
    float d;
    scanf("%d", &radius);
    for (r = 0; r <= 2 * radius; r++)
    { //Outer loop
        for (c = 0; c <= 2 * radius; c++)
        {                                                                        //Inner loop
            d = sqrt((r - radius) * (r - radius) + (c - radius) * (c - radius)); //Logic Part
            if (d > radius - 0.5 && d < radius + 0.5)
                //Print star or whitespace
                printf("%c",(c+ascii));
            else
                printf(" ");
        }
        printf("\n");
        //Prints a newline
    }
    return 0;
}
Output:

Radius :  5
    DEFGH   
  C          I  
 B             J 
A              K
A              K
A              K
A              K
A              K
 B             J 
  C          I  
   DEFGH

C++ Code to Print Hollow Circle Character Pattern

#include <iostream>
#include <math.h>
using namespace std;
int main(int argc, char const *argv[])
{
    cout << "Radius : ";
    //Taking radius as input from user
    int radius, r, c;
    // starting ASCII value taken 65
    int ascii=65;
    cin >> radius;
    float d;
    for (r = 0; r <= 2 * radius; r++)
    {
        for (c = 0; c <= 2 * radius; c++)
        {
            d = sqrt((r - radius) * (r - radius) + (c - radius) * (c - radius)); //Logic Part
            //Logic Part
            if (d > radius - 0.5 && d < radius + 0.5)
                //Print character or whitespace
                cout << (char)(c+ascii);
            else
                cout << " ";
        }
        //Prints a newline
        cout << endl;
    }
    return 0;
}
Output:

Radius :   5

   DEFGH   
  C         I  
 B           J 
A             K
A             K
A             K
A             K
A             K
 B            J 
  C         I  
   DEFGH

Are you seeking professional help for coding in the Java programming language? The tutorial of Java Programming Examples for beginners and experts will strongly improve your coding skills then you can program for any logic in Java.

Related Java Character Pattern Programs: