Important Notice:

Practice-It will be discontinued as of November 1st, 2024. After this date, the website will remain online for a transitional period, but login will be restricted to University of Washington NetID authentication. This marks the next phase towards the platform's full retirement. Thank you for your use and support of the application over the years.

If you are looking for an alternative, a similar tool, CodeStepByStep, was developed independently by the original author of Practice-It, and is available at codestepbystep.com**

logo Practice-It logo

Main Page → Problems → Solve a Problem

writeNums

Language/Type: Java recursion recursive programming
Author: Stuart Reges (on 2014/02/13)

Write a method writeNums that takes an integer n as a parameter and that writes the first n integers starting with 1 to System.out in sequential order and separated by commas. All output should be on the current line of output.

For example, the following calls: 

        writeNums(5);
        System.out.println(); // to complete the line of output
        writeNums(12);
        System.out.println(); // to complete the line of output

should produce the output: 

        1, 2, 3, 4, 5
        1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12

You must exactly reproduce the format of the examples above. Your method should throw an IllegalArgumentException if passed a value less than 1.

You may NOT use a while loop, for loop or do/while loop to solve this problem; you must use recursion.

Write your solution to writeNums below.

Type your solution here:


This is a method problem. Write a Java method as described. Do not write a complete program or class; just the method(s) above.

You must log in before you can solve this problem.


Log In

If you do not understand how to solve a problem or why your solution doesn't work, please contact your TA or instructor.
If something seems wrong with the site (errors, slow performance, incorrect problems/tests, etc.), please

Is there a problem? Contact a site administrator.