Java Program for Print Number series without using any loop

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.



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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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Output:

20 14 8 2 -4 2 8 14 20

Please refer complete article on Print Number series without using any loop for more details!



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