Program to Print Hollow Circle Star Pattern
In this article we are going to see how to print the hollow circle star pattern
Example-1 When radius value = 6 ***** ** ** ** ** * * * * * * * * * * * * * * ** ** ** ** *****
Example-2 When radius value = 9 ******* *** *** ** ** * * ** ** * * ** ** * * * * * * * * * * ** ** * * ** ** * * ** ** *** *** *******
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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 star symbols according to the iteration.
JAVA Code:
Method-1 : Static Star Character
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 r, c, radius = scan.nextInt(); double d; 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 star or whitespace System.out.print("*"); else System.out.print(" "); } System.out.println(); //Prints a newline } } }
Output Radius : 6 ***** ** ** ** ** * * * * * * * * * * * * * * ** ** ** ** *****
Method-2 : User Input Character
import java.util.Scanner; class Main { public static void main(String[] args) { int r, c, radius; Scanner scan = new Scanner(System.in); System.out.print("Radius : "); //Taking radius of the circle as input from user radius = scan.nextInt(); double d; char l; System.out.print("Character : "); //Taking any random character as input from user l = scan.next().charAt(0); 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 star or whitespace System.out.print(l); else System.out.print(" "); } System.out.println(); //Prints a newline } } }
Output Radius : 6 Character : * ***** ** ** ** ** * * * * * * * * * * * * * * ** ** ** ** *****
C Code:
#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; 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("*"); else printf(" "); } printf("\n"); //Prints a newline } return 0; }
Output Radius : 6 ***** ** ** ** ** * * * * * * * * * * * * * * ** ** ** ** *****
C++ Code:
#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; 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 star or whitespace cout << "*"; else cout << " "; } //Prints a newline cout << endl; } return 0; }
Output Radius : 6 ***** ** ** ** ** * * * * * * * * * * * * * * ** ** ** ** *****
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