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Java Program for Print Number series without using any loop

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  • Last Updated : 04 Aug, 2022
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Givens Two number N and b, 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 becomes the original number(N). 

Remember: Here we are 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 

Output explanation: We can do it using recursion idea 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 functions we used a Boolean flag

JAVA




// Java program to Print Number
// series without using loop
 
import java.io.*;
import java.util.*;
 
class GFG {
 
    // Method
    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& lt; = 0)
            flag = !flag;
 
        // base condition for
        // second_case (Adding K)
        if (N == Original & amp; & !flag)
 
            return;
 
        // If flag is true, we subtract value until
        // number is greater than 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

Output:

20 14 8 2 -4 2 8 14 20

Time complexity: O(N) for given input N

Auxiliary space: O(1)

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


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