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Print Number series without using any loop
  • Difficulty Level : Basic
  • Last Updated : 25 Apr, 2018

Problem – Givens Two number N and K, our task is to subtract a number K from N until number(N) is greater than zero, once the N becomes negative or zero then we start adding K until that number become the original number(N).
Note : Not allow to use any loop.

Examples :

Input : N = 15 K = 5  
Output : 15 10 5 0 1 5 10 15

Input : N = 20 K = 6
Output : 20 14 8 2 -4 2 8 14 20 

Explanation – We can do it using recursion idea is that we call the function again and again until N is greater than zero (in every function call we subtract N by K). Once the number becomes negative or zero we start adding K in every function call until the number becomes the original number. Here we use a single function for both addition and subtraction but to switch between addition or subtraction function we used a Boolean flag.

C++

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// C++ program to Print Number
// series without using loop
#include <iostream>
  
using namespace std;
  
// function print series
// using recursion
void PrintNumber(int N, int Original, int K, bool flag)
{
  
    // print the number
    cout << N << " ";
  
    // change flag if number
    // become negative
    if (N <= 0)
        flag = !flag;
  
    // base condition for
    // second_case (Adding K)
    if (N == Original && !flag)
  
        return;
  
    // if flag is true
    // we subtract value until
    // number is greater then zero
    if (flag == true) {
  
        PrintNumber(N - K, Original, K, flag);
  
        return;
    }
  
    // second case (Addition )
    if (!flag) {
  
        PrintNumber(N + K, Original, K, flag);
  
        return;
    }
}
  
// driver program
int main()
{
  
    int N = 20, K = 6;
  
    PrintNumber(N, N, K, true);
  
    return 0;
}

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Java

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// Java program to Print Number
// series without using loop
  
import java.io.*;
import java.util.*;
  
class GFG
{
    public static void PrintNumber(int N, int Original, int K, boolean flag)
    {
  
        // print the number
        System.out.print(N + " ");
  
        // change flag if number
        // become negative
        if (N <= 0)
            flag = !flag;
  
        // base condition for
        // second_case (Adding K)
        if (N == Original && !flag)
  
            return;
  
        // if flag is true
        // we subtract value until
        // number is greater then zero
        if (flag == true)
        {
            PrintNumber(N - K, Original, K, flag);
            return;
        }
  
        // second case (Addition )
        if (!flag)
        {
            PrintNumber(N + K, Original, K, flag);
            return;
        }
    }
  
    public static void main (String[] args)
    {
        int N = 20, K = 6;
        PrintNumber(N, N, K, true);
    }
}
// This code is contributed by Mohit Gupta_OMG

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Python3

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# Python program to Print Number
# series without using loop
  
def PrintNumber(N, Original, K, flag):
    #print the number
    print(N, end = " ")
      
    # change flag if number
    # become negative
      
    if (N <= 0):
        if(flag==0):
            flag = 1
        else:
            flag = 0
          
    # base condition for
    # second_case (Adding K)
      
    if (N == Original and (not(flag))):
        return
      
    # if flag is true
    # we subtract value until
    # number is greater then zero
      
    if (flag == True):
        PrintNumber(N - K, Original, K, flag)
        return
      
    # second case (Addition )
    if (not(flag)):
        PrintNumber(N + K, Original, K, flag);
        return
      
N = 20
K = 6
PrintNumber(N, N, K, True)
  
# This code is contributed by Mohit Gupta_OMG

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C#

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// C# program to Print Number
// series without using loop
using System;
  
public class GFG {
          
    // function print series
    // using recursion
    static void PrintNumber(int N,
             int Original, int K, bool flag)
    {
      
        // print the number
        Console.Write(N + " ");
      
        // change flag if number
        // become negative
        if (N <= 0)
            flag = !flag;
      
        // base condition for
        // second_case (Adding K)
        if (N == Original && !flag)
            return;
      
        // if flag is true
        // we subtract value until
        // number is greater then zero
        if (flag == true)
        {
            PrintNumber(N - K, Original, K,
                                      flag);
            return;
        }
      
        // second case (Addition )
        if (!flag)
        {
            PrintNumber(N + K, Original, K,
                                      flag);
            return;
        }
    }
      
    // driver program
    static public void Main ()
    {
        int N = 20, K = 6;
  
        PrintNumber(N, N, K, true);
    }
}
  
// This code is contributed by vt_m.

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PHP

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<?php
// PHP program to Print Number
// series without using loop
  
// function print series
// using recursion
function PrintNumber($N, $Original
                     $K, $flag)
{
  
    // print the number
    echo($N . " ");
  
    // change flag if number
    // become negative
    if ($N <= 0)
        $flag = !$flag;
  
    // base condition for
    // second_case (Adding K)
    if ($N == $Original && !$flag)
  
        return;
  
    // if flag is true
    // we subtract value until
    // number is greater then zero
    if ($flag == true) {
  
        PrintNumber($N - $K, $Original
                         $K, $flag);
  
        return;
    }
  
    // second case (Addition )
    if (!$flag) {
  
        PrintNumber($N + $K, $Original
                         $K, $flag);
  
        return;
    }
}
  
// Driver Code
$N = 20; $K = 6;
  
PrintNumber($N, $N, $K, true);
  
// This code is contributed by Ajit.
?>

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Output :

20 14 8 2 -4 2 8 14 20 

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