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Program to print Reverse Floyd’s triangle
  • Difficulty Level : Expert
  • Last Updated : 01 Nov, 2018

Floyd’s triangle is a triangle with first natural numbers. Task is to print reverse of Floyd’s triangle.

Examples:

Input : 4
Output :
10 9 8 7
6 5 4 
3 2 
1 

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

C++

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// CPP program to print reverse of
// floyd's triangle
#include <bits/stdc++.h>
using namespace std;
  
void printReverseFloyd(int n)
{
    int curr_val = n * (n + 1) / 2;
    for (int i = n; i >= 1; i--) {
        for (int j = i; j >= 1; j--) {
            cout << setprecision(2);
            cout << curr_val-- << "  ";
        }
  
        cout << endl;
    }
}
  
// Driver's Code
int main()
{
    int n = 7;
    printReverseFloyd(n);
    return 0;
}
  
// this article is contributed by manish kumar rai

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Java

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// Java program to print reverse of
// floyd's triangle
import java.io.*;
  
class GFG {
    static void printReverseFloyd(int n)
    {
        int curr_val = n * (n + 1) / 2;
        for (int i = n; i >= 1; i--) {
            for (int j = i; j >= 1; j--) {
                System.out.printf("%2d  ", curr_val--);
            }
  
            System.out.println("");
        }
    }
  
    // Driver method
    public static void main(String[] args)
    {
        int n = 7;
        printReverseFloyd(n);
    }
}
// this article is contributed by manish kumar rai

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Python3

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# Python3 program to print reverse of 
# floyd's triangle
def printReverseFloyd(n):
  
    curr_val = int(n*(n + 1)/2)
    for i in range(n + 1, 1, -1):
        for j in range(i, 1, -1):
            print(curr_val, end ="  ")
            curr_val -= 1
          
        print("")
          
# Driver code
n = 7
printReverseFloyd(n)

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C#

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// C# program to print reverse 
// of floyd's triangle
using System;
using System.Globalization;
  
class GFG
{
    static void printReverseFloyd(int n)
    {
        int curr_val = n * (n + 1) / 2;
        for (int i = n; i >= 1; i--)
        {
            for (int j = i; j >= 1; j--) 
            {
                Console.Write(curr_val-- + " ");
            }
  
            Console.WriteLine("");
        }
    }
      
    // Driver Code
    public static void Main()
    {
        int n = 7;
        printReverseFloyd(n);
    }
      
}
  
// This code is contributed by Sam007

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PHP

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<?php
// PHP program to print reverse 
// of floyd's triangle 
function printReverseFloyd($n
    $curr_val = $n * ($n + 1) / 2; 
    for ($i = $n; $i >= 1; $i--) 
    
        for ( $j = $i; $j >= 1; $j--) 
        
            echo $curr_val-- , " "
        
  
        echo " \n"
    
  
// Driver Code 
$n = 7; 
printReverseFloyd($n); 
  
// This code is contributed by ajit 
?>

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Output:

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



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