Write a Java program to print left pascals number triangle using for loop.
import java.util.Scanner; public class LeftPascalNumber1 { private static Scanner sc; public static void main(String[] args) { sc = new Scanner(System.in); int i, j, k; System.out.print("Enter Left Pascals Number Triangle Pattern Rows = "); int rows = sc.nextInt(); System.out.println("Printing Left Pascals Triangle Number Pattern"); for (i = 1 ; i <= rows; i++ ) { for (j = i ; j < rows; j++ ) { System.out.print(" "); } for(k = 1; k <= i; k++) { System.out.print(k + " "); } System.out.println(); } for (i = rows; i >= 1; i-- ) { for (j = i ; j <= rows; j++ ) { System.out.print(" "); } for(k = 1; k < i; k++) { System.out.print(k + " "); } System.out.println(); } } }

This Java example displays the left pascal triangle number pattern using a while loop.
import java.util.Scanner; public class LeftPascalNumber2 { private static Scanner sc; public static void main(String[] args) { sc = new Scanner(System.in); System.out.print("Enter Left Pascals Number Triangle Pattern Rows = "); int rows = sc.nextInt(); System.out.println("Printing Left Pascals Triangle Number Pattern"); int i = 1, j, k; while (i <= rows ) { j = i ; while ( j < rows ) { System.out.print(" "); j++; } k = 1; while( k <= i) { System.out.print(k + " "); k++; } System.out.println(); i++; } i = rows; while (i >= 1) { j = i ; while (j <= rows) { System.out.print(" "); j++; } k = 1; while( k < i) { System.out.print(k + " "); k++; } System.out.println(); i--; } } }
Enter Left Pascals Number Triangle Pattern Rows = 7
Printing Left Pascals Triangle Number Pattern
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1
Java Program to Print Left Pascals Number Triangle using do while loop.
import java.util.Scanner; public class LeftPascalNumber3 { private static Scanner sc; public static void main(String[] args) { sc = new Scanner(System.in); System.out.print("Enter Left Pascals Number Triangle Pattern Rows = "); int rows = sc.nextInt(); System.out.println("Printing Left Pascals Triangle Number Pattern"); int i = 1, j, k; do { j = i ; do { System.out.print(" "); } while ( j++ < rows ); k = 1; do { System.out.print(k + " "); } while( ++k <= i); System.out.println(); } while (++i <= rows ); i = rows; do { j = i - 1; do { System.out.print(" "); } while (++j <= rows); k = 1; do { System.out.print(k + " "); } while( ++k < i); System.out.println(); } while (--i > 1) ; } }
Enter Left Pascals Number Triangle Pattern Rows = 9
Printing Left Pascals Triangle Number Pattern
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7
1 2 3 4 5 6
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1