In this post, we will see how to print numbers from 1 to N without using loop.
Problem
Print number from 1 to N without using any loop.
N=10
Output: 1 2 3 4 5 6 7 8 9 10
Output: 1 2 3 4 5 6 7 8 9 10
Using Recursion
We can use tail recursion to solve this problem.
- Base case
- When n <= 0, return
- call printNumbers recursively with n-1
- Print number while returning from recursion.
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 |
package org.arpit.java2blog; public class PrintNumbersWithoutLoop { public static void main(String[] args) { PrintNumbersWithoutLoop pnwl=new PrintNumbersWithoutLoop(); pnwl.printNumbers(10); } public void printNumbers(int n) { if(n<=0) { return; } else { // Recursively call printNumbers printNumbers(n-1); // Print number while returning from recursion System.out.print(" "+n); } } } |
Output
1 2 3 4 5 6 7 8 9 10
That’s all about how to print Numbers from 1 to N without using loop.
