## Friday, 19 August 2016

### Chapter 6 Exercise 6, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

*6.6 (Display patterns) Write a method to display a pattern as follows:

1
2 1
3 2 1
...
n n-1 ... 3 2 1

public static void displayPattern(int n)

import java.util.Scanner;

public class ProgrammingExercise6_6 {

public static void main(String[] args) {

System.out.print("Enter the number of lines:");
Scanner input = new Scanner(System.in);

// get the total number of lines n.
int n = input.nextInt();
displayPattern(n);
}

public static void displayPattern(int n) {

for (int i = 1; i <= n; i++) {
// printing spaces, 2 at a time from j=1 to j= n-i
for (int j = 1; j <= (n - i); j++) {

//Using loop handle multiple digit number
//loop to find out the number of digit
//Number to printed on this row is (n-(j-1))
int numberOfDigit=0;
int remainder = n-(j-1);
while (remainder!=0) {
numberOfDigit++;
remainder /=10;
}
//Print additional spaces-start at -1 to print a space between column
for (int k = -1; k < numberOfDigit; k++) {
System.out.print(" ");
}

}

// Printing number decrementally from line number i to 1
for (int j = i; j >= 1; j--) {
System.out.print(j + " ");

}
System.out.println();

}
}

}