Objective: Given a number N, write an program to print from number 1 to N without using loop.
Example:
N = 20 Output: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Approach: Use Recursion
- Make recursive to N = N-1.
- In tail recursion, print the number
Code:
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| public class PrintNumbersWithOutLoop { | |
| static void printNumbers(int number){ | |
| if(number<=0) | |
| return; | |
| //else make a recursive call | |
| printNumbers(number–1); | |
| //print number in tail recursive | |
| System.out.print(number + " "); | |
| } | |
| public static void main(String[] args) { | |
| int n = 20; | |
| printNumbers(n); | |
| } | |
| } |
Output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20