Pattern-Problems/Butterfly.java at main · VivekDahiya06/Pattern-Problems · GitHub

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import java.util.Scanner;
public class Butterfly {
    public static void main(String[] args) {
        Scanner r=new Scanner(System.in);
        System.out.print("Enter the no. of times to run the loop : ");
        int n=r.nextInt();
        if(n%2==0){//                       Pattern if the no. of loops are even
            for(int i=1;i<=n/2;i++){//      Loop to print upper part of Butterfly
                for(int j=1;j<=i;j++){System.out.print("*");}
                for(int j=1;j<=2*((n/2)-i);j++){System.out.print(" ");}
                for(int j=1;j<=i;j++){System.out.print("*");}
                System.out.println();
            }
            for(int i=n/2;i>=1;i--){//      Loop to print lower part of Butterfly
                for(int j=1;j<=i;j++){System.out.print("*");}
                for(int j=1;j<=2*((n/2)-i);j++){System.out.print(" ");}
                for(int j=1;j<=i;j++){System.out.print("*");}
                System.out.println();
            }}
        else{//                             Pattern if the no. of loops are odd
            for(int i=1;i<=(n/2)-1;i++){//  Loop to print upper part of Butterfly
                for(int j=1;j<=i;j++){System.out.print("*");}
                for(int j=1;j<=2*((n/2)-i);j++){System.out.print(" ");}
                for(int j=1;j<=i;j++){System.out.print("*");}
                System.out.println();
            }
            for(int i=n/2;i>=1;i--){//      Loop to print lower part of Butterfly
                for(int j=1;j<=i;j++){System.out.print("*");}
                for(int j=1;j<=2*((n/2)-i);j++){System.out.print(" ");}
                for(int j=1;j<=i;j++){System.out.print("*");}
                System.out.println();
            }}
    }}