Print Pascals triangle using java program

• Pascals triangle means arranging numbers in pascal triangle format.
• First row starts with number 1.
• Here is the pascal triangle with 8 rows.

•  The sum of all numbers in each row will be double the sum of all numbers in above row
•  The diagonals adjacent to the border diagonals of 1's contains natural numbers in order

 Program #1: Java example program to print  numbers in pascals triangle pattern.

1. package interviewprograms.instanceofjava;
2. 
   
3. import java.util.Scanner;
4. /*
5.  * www.instanceofjava.com
6.  */
7. public class PasclasTriangleProgram {
8. 
   
9. public static void main(String args[]){
11. Scanner in = new Scanner(System.in);
12. System.out.println("Enter number of rows ");
13. 
    
14. int rows= in.nextInt();
15. 
    
16.  for(int i =0;i<rows;i++) {
17. 
    
18.         int number = 1;
19.   
20.   System.out.format("%"+(rows-i)*2+"s","");
21. 
    
22.  for(int j=0;j<=i;j++) {
23. 
    
24.     System.out.format("%4d",number);
25. 
    
26.       number = number * (i - j) / (j + 1);
27. 
    
28. }
29. 
    
30.   System.out.println();
31. 
    
32. }
33. 
    
34. }
35. }        

Output:

1. Enter number of rows 
2. 8
3.                    1
4.                  1   1
5.                1   2   1
6.              1   3   3   1
7.            1   4   6   4   1
8.          1   5  10  10   5   1
9.        1   6  15  20  15   6   1
10.      1   7  21  35  35  21   7   1

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