# Java Program to Print Pascal Triangle

Here is a java program to print pascal triangle till N rows. In this java program, we have to print the pascal triangle on screen till N rows. We will take number of rows as input from user. Before jumping into java program, here is the brief introduction of pascal triangle.

For Example : pascal triangle of 5 rows.
```      1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
```

Pascal Triangle is an isosceles triangle of binomial coefficients. Nth row of pascal triangle contains N binomial coefficients. Here is the formula to find the value of nth element of rth row of pascal triangle. ## Java program to print pascal triangle

In this java program, we first take number of rows as input from user and store it in variable "rows". Here we are using nested for loops to print pascal triangle. One iteration of outer for loop will print one row of pascal triangle. Inside the body of outer for loop we have two inner for loop, first for loop will print the spaces and second for loop will print the binomial coefficients of current row by using "getFactorial" function.

```package com.tcc.java.programs;

import java.util.Scanner;

public class PascalTriangle {
public static void main(String args[]) {
int row, rows, i, num;
Scanner scanner = new Scanner(System.in);
System.out.println("Enter Number
of Rows in Pascal Triangle");
rows = scanner.nextInt();

// Print Pascal Triangle
for (row = 0; row < rows; row++) {
// Print Spaces for every row
for (i = row; i <= rows; i++)
System.out.print("  ");

for (i = 0; i <= row; i++) {
num = getFactorial(row) / (getFactorial(i) *
getFactorial(row - i));
System.out.print("  " + num);
}
System.out.print("\n");
}
}

public static int getFactorial(int N) {
if (N < 0) {
// Invalid input
return -1;
}

int nFactorial = 1, i;
// N! = N*(N-1)*(N-2)*(N-3)*.....*3*2*1
for (i = 1; i <= N; i++) {
nFactorial = nFactorial * i;
}
return nFactorial;
}
}
```
Output
```Enter Number of Rows in Pascal Triangle
5
1
1  1
1  2  1
1  3  3  1
1  4  6  4  1
```

Recommended Posts
 Java Program to Print Pyramid Pattern of Stars Java Program to Print Right Triangle Star Pattern Java Program to Print Inverted Right Triangle Star Pattern Java Program to Print Inverted Pyramid Pattern of Stars Java Program to Print Right Triangle Pattern of Natural Numbers Java Program to Print Diamond Pattern of Star Character Java program to Print Square Pattern of Star Character Java Program to Print Multiplication Table Triangle Pattern Java Program to Print Multiplication Table of Number Java Program to Merge Two Sorted Arrays Java Program to Reverse a String All Java Programs