Java Program to Print Pascal’s Triangle Number Pattern

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Printing Pascal’s Triangle Number Pattern

In the previous article, we have discussed Java Program to Print Pant Number Pattern(Second Approach)

In this article we are going to see how to print the Pascal’s triangle number pattern.

Example-1

When rows value = 5

     1
    1 1
   1 2 1
  1 3 3 1
 1 4 6 4 1
Example-2:

When rows value=7

            1
           1 1
          1 2 1
        1 3 3 1
      1 4 6 4 1
   1 5 10 10 5 1
 1 6 15 20 15 6 1

Now, let’s see the actual program to print it.

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Approach:

  • Enter total number of rows and store it in an integer variable rows
  • Take one outer for loop to iterate the rows.
  • Take two inner for loops, one to print the space and the other to print number.
  • After each iteration print a new line.

Java Code to Print Pascal’s Triangle Number Pattern

import java.util.Scanner;
class Main
{
public static void main(String[] args)
{
    //Create a new Scanner object
    Scanner scan = new Scanner(System.in);

    //Taking number of rows as input from user
    System.out.print("Rows : ");
    int rows = scan.nextInt();

   //Row and column are the iterators, space is the number of space and tempHolder is the value holder
    int numberOfRows, numberOfColumns, tempHolder = 1;

   //Outer loop to iterate the rows
   //Iterates from 0 to one less than number of rows entered by the user
    for (numberOfRows = 0; numberOfRows < rows; numberOfRows++)
    {
         //Inner loop to print space
        for (numberOfColumns = 1; numberOfColumns <= rows - numberOfRows; numberOfColumns++)
        {
                System.out.print(" ");
        }
        //Inner loop to print number
        for (numberOfColumns = 0; numberOfColumns <= numberOfRows; numberOfColumns++)
        {
            if (numberOfColumns == 0 || numberOfRows == 0)
                tempHolder = 1;
            else
                tempHolder = tempHolder * (numberOfRows - numberOfColumns + 1) / numberOfColumns;
                System.out.print(tempHolder+ " ");
            }
            //Prints a newline
            System.out.println();
        }
}
}


Output:

Rows : 5

     1
    1 1
   1 2 1
  1 3 3 1
 1 4 6 4 1

C Code to Print Pascal’s Triangle Number Pattern

#include <stdio.h>

int main()
{
   //Taking total number of rows as input from user
   printf("Rows : ");
   int rows;
   scanf("%d", &rows);

   //Row and column are the iterators, space is the number of space and tempHolder is the value holder
   int numberOfRows, numberOfColumns, tempHolder = 1;

   //Outer loop to iterate the rows
   //Iterates from 0 to one less than number of rows entered by the user
   for (numberOfRows = 0; numberOfRows < rows; numberOfRows++)
   {
      //Inner loop to print space
      for (numberOfColumns = 1; numberOfColumns <= rows - numberOfRows; numberOfColumns++)
      {
         printf(" ");
      }
      //Inner loop to print number
      for (numberOfColumns = 0; numberOfColumns <= numberOfRows; numberOfColumns++)
      {
         if (numberOfColumns == 0 || numberOfRows == 0)
            tempHolder = 1;
         else
            tempHolder = tempHolder * (numberOfRows - numberOfColumns + 1) / numberOfColumns;
         printf("%d ", tempHolder);
      }
      //Prints a newline
      printf("\n");
   }
   return 0;
}

Output:

Rows : 5

      1
    1 1
   1 2 1
  1 3 3 1
 1 4 6 4 1

C++ Code to Print Pascal’s Triangle Number Pattern

#include <iostream>
using namespace std;
int main(int argc, char const *argv[])
{
    //Taking total number of rows as input from user
    printf("Rows : ";
    int rows;
    cin >> rows;

    //Row and column are the iterators, space is the number of space and tempHolder is the value holder
    int numberOfRows, numberOfColumns, tempHolder = 1;

    //Outer loop to iterate the rows
    //Iterates from 0 to one less than number of rows entered by the user
    for (numberOfRows = 0; numberOfRows < rows; numberOfRows++)
    {
        //Inner loop to print space
        for (numberOfColumns = 1; numberOfColumns <= rows - numberOfRows; numberOfColumns++)
        {
            cout << " ";
        }
        //Inner loop to print number
        for (numberOfColumns = 0; numberOfColumns <= numberOfRows; numberOfColumns++)
        {
            if (numberOfColumns == 0 || numberOfRows == 0)
                tempHolder = 1;
            else
                tempHolder = tempHolder * (numberOfRows - numberOfColumns + 1) / numberOfColumns;
            cout << tempHolder << " ";
        }
        //Prints a newline
        cout << endl;
    }
    return 0;
}


Output:

Rows : 5

     1
    1 1
   1 2 1
  1 3 3 1
 1 4 6 4 1

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