Java Program to Print Reverse Floyd’s Triangle Number Pattern

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Print Reverse Floyd’s Triangle Number Pattern

In the previous article, we have discussed Java Program to Print Floyd’s Triangle Number Pattern

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

Example-1

When rows value = 5

15 14 13 12 11
10 9 8 7
6 5 4
3 2
1
Example-2:

When rows value=7

28 27 26 25 24 23 22
21 20 19 18 17 16
15 14 13 12 11
10 9 8 7
6 5 4
3 2
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 one inner for loop to iterate the columns.
  • After each iteration print a new line.

Java Code to Print Reverse Floyd’s Triangle Number Pattern

import java.util.Scanner;
class pattern
{
//Function to set the counter
static int calculateCounter(int rows)
{
    int sum = 0;
    for (int i = 1; i <= rows; i++)
    {
        sum += i;
    }
    return sum;
}

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

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

   //Row and column are the iterators and counter to print
    int numberOfRows, numberOfColumns, counter = calculateCounter(rows);

    //Outer loop to iterate the rows
    //Iterates from 1 to the number of rows entered by the user(backwards)
    for (numberOfRows = rows; numberOfRows >= 1; --numberOfRows)
    {
        //Inner loop to print number
        //Iterator iterates from 1 to the numberOfRows 
        for (numberOfColumns = 1; numberOfColumns <= numberOfRows; ++numberOfColumns)
        {
            System.out.print(counter-- + " ");
        }
    //Prints a newline
    System.out.println();
    }
}
}


Output:

Rows : 5

15 14 13 12 11
10 9 8 7
6 5 4
3 2
1

C Code to Print Reverse Floyd’s Triangle Number Pattern

#include <stdio.h>
//Function to set the counter
int calculateCounter(int rows)
{
   int sum = 0;
   for (int i = 1; i <= rows; i++)
   {
      sum += i;
   }
   return sum;
}

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

   //Row and column are the iterators and counter to print
   int numberOfRows, numberOfColumns, counter = calculateCounter(rows);

   //Outer loop to iterate the rows
   //Iterates from 1 to the number of rows entered by the user(backwards)
   for (numberOfRows = rows; numberOfRows >= 1; --numberOfRows)
   {
      //Inner loop to print number
      //Iterator iterates from 1 to the numberOfRows
      for (numberOfColumns = 1; numberOfColumns <= numberOfRows; ++numberOfColumns)
      {
         printf("%d ", counter--);
      }
      //Prints a newline
      printf("\n");
   }
   return 0;
}

Output:

Rows : 5

15 14 13 12 11
10 9 8 7
6 5 4
3 2
1

C++ Code to Print Reverse Floyd’s Triangle Number Pattern

#include <iostream>
using namespace std;

//Function to set the counter
int calculateCounter(int rows)
{
    int sum = 0;
    for (int i = 1; i <= rows; i++)
    {
        sum += i;
    }
    return sum;
}

//Main Function
int main(int argc, char const *argv[])
{
    //Taking total number of rows as input from user
    cout << "Rows : ";
    int rows;
    cin >> rows;

    //Row and column are the iterators and counter to print
    int numberOfRows, numberOfColumns, counter = calculateCounter(rows);

    //Outer loop to iterate the rows
    //Iterates from 1 to the number of rows entered by the user(backwards)
    for (numberOfRows = rows; numberOfRows >= 1; --numberOfRows)
    {
        //Inner loop to print number
        //Iterator iterates from 1 to the numberOfRows
        for (numberOfColumns = 1; numberOfColumns <= numberOfRows; ++numberOfColumns)
        {
            cout << counter-- << " ";
        }
        //Prints a newline
        cout << endl;
    }
    return 0;
}


Output:

Rows : 5

15 14 13 12 11
10 9 8 7
6 5 4
3 2
1

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