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butterfly_pattern.java

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package butterfly_pattern;

import java.util.*;

public class Butterfly {

public static void main(String[] args) {

Scanner in = new Scanner(System.in);

int n = in.nextInt();

// upper half

for (int i = 1; i <= n; i++) {

for (int j = 1; j <= i; j++) {

System.out.print("*");

}

int spaces = 2 * (n - i);

for (int j = 1; j <= spaces; j++) {

System.out.print(" ");

}

for (int j = 1; j <= i; j++) {

System.out.print("*");

}

System.out.println();

}

//lower half

for (int i = n; i >= 1; i--) {

for (int j = 1; j <= i; j++) {

System.out.print("*");

}

int spaces = 2 * (n - i);

for (int j = 1; j <= spaces; j++) {

System.out.print(" ");

}

for (int j = 1; j <= i; j++) {

System.out.print("*");

}

System.out.println();

}

}

}