Java Program to print Pascal Triangle

In this tutorial, we will write a java program to print Pascal Triangle.

Java Example to print Pascal’s Triangle

In this program, user is asked to enter the number of rows and based on the input, the pascal’s triangle is printed with the entered number of rows.

package com.beginnersbook;
import java.util.Scanner;
public class JavaExample {
    static int fact(int num) {
	int factorial;

	for(factorial = 1; num > 1; num--){
		factorial *= num;
	}
	return factorial;
    }
    static int ncr(int n,int r) {
	return fact(n) / ( fact(n-r) * fact(r) );
    }
    public static void main(String args[]){
	int rows, i, j;

	//getting number of rows from user
	System.out.println("Enter number of rows:");
	Scanner scanner = new Scanner(System.in);
	rows = scanner.nextInt();
	scanner.close();

	System.out.println("Pascal Triangle:");
	for(i = 0; i < rows; i++) {
		for(j = 0; j < rows-i; j++){
			System.out.print(" ");
		}
		for(j = 0; j <= i; j++){
			System.out.print(" "+ncr(i, j));
		}
		System.out.println();
 	}
    }
}

Output:

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