Pascal triangle in java – Java Program to Print Right Pascal’s Triangle Number Pattern

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Print Right Pascal’s Triangle Number Pattern

Pascal triangle in java: 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 right Pascal’s triangle number pattern.

Example-1

When row value=4

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

When row value=5

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1

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

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Approach:

  • Enter total row and store it in an integer variable rows.
  • Take one outer for loop to iterate the rows.
  • Take two inner for loops, to print the character values of upper half and lower half triangle.
  • After each iteration print a new line.

Java Code to Print Right 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
    int numberOfRows, numberOfColumns;

    //Outer loop to iterate the rows (upper half)
    //Iterates from 1 to number of rows entered by the user
    for (numberOfRows = 1; numberOfRows<=rows; numberOfRows++)
    {
        //Inner loops to iterate the columns
        for (numberOfColumns = 1; numberOfColumns <= numberOfRows; numberOfColumns++)
        {
            //Prints number
            System.out.print(numberOfColumns+ " ");
        }
        //Prints a newline
        System.out.println();
    }

    //Second outer loop to iterate the rows (lower half)
    //Iterates from number of rows entered by the user to number 1
    for (numberOfRows = rows; numberOfRows>=1; numberOfRows--)
    {
        //Inner loops to iterate the columns
        for (numberOfColumns = 1; numberOfColumns < numberOfRows; numberOfColumns++)
        {
            //Prints number
            System.out.print(numberOfColumns+ " ");
        }
        //Prints a newline
        System.out.println();
    }
}
}


Output:

Rows : 5

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1

C Code to Print Right 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
    int numberOfRows, numberOfColumns;

    //Outer loop to iterate the rows (upper half)
    //Iterates from 1 to number of rows entered by the user
    for (numberOfRows = 1; numberOfRows <= rows; numberOfRows++)
    {
        //Inner loops to iterate the columns
        for (numberOfColumns = 1; numberOfColumns <= numberOfRows; numberOfColumns++)
        {
            //Prints number
            printf("%d ", numberOfColumns);
        }
        //Prints a newline
        printf("\n");
    }

    //Second outer loop to iterate the rows (lower half)
    //Iterates from number of rows entered by the user to number 1
    for (numberOfRows = rows; numberOfRows >= 1; numberOfRows--)
    {
        //Inner loops to iterate the columns
        for (numberOfColumns = 1; numberOfColumns < numberOfRows; numberOfColumns++)
        {
            //Prints number
            printf("%d ", numberOfColumns);
        }
        //Prints a newline
        printf("\n");
    }
    return 0;
}

Output:

Rows : 5

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1

C++ Code to Print Right 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
    int numberOfRows, numberOfColumns;

    //Outer loop to iterate the rows (upper half)
    //Iterates from 1 to number of rows entered by the user
    for (numberOfRows = 1; numberOfRows <= rows; numberOfRows++)
    {
        //Inner loops to iterate the columns
        for (numberOfColumns = 1; numberOfColumns <= numberOfRows; numberOfColumns++)
        {
            //Prints number
            cout << numberOfColumns << " ";
        }
        //Prints a newline
        cout << endl;
    }

    //Second outer loop to iterate the rows (lower half)
    //Iterates from number of rows entered by the user to number 1
    for (numberOfRows = rows; numberOfRows >= 1; numberOfRows--)
    {
        //Inner loops to iterate the columns
        for (numberOfColumns = 1; numberOfColumns < numberOfRows; numberOfColumns++)
        {
            //Prints number
            cout << numberOfColumns << " ";
        }
        //Prints a newline
        cout << endl;
    }
    return 0;
}


Output:

Rows : 5

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1

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