CODEWITHSUNDEEP
c#for-loop
AcidRod75
AcidRod75

Reputation: 187

Simple loop, not so simple Error

I´m getting an error that is driving me crazy... i can´t find what is wrong with this code, any one will be so kind to give me some assistance?

using System;

class Program
{
    static void Main(string[] args)
    {   
        for(int i = args[0].Length; i >= 1; i--){
            Console.WriteLine(args[0].Substring(i, 1));
        }
    }
}

A run example should be like: program.exe 6735

And the output will looks like:

5

3

7

6

So far the only thing i am getting is:

Unhandled Exception: System.ArgumentOutOfRangeException: startIndex + length > this.length Parameter name: length at System.String.Substring (Int32 startIndex, Int32 length) [0x00000] in :0 at Program.Main (System.String[] args) [0x00000] in :0

Thank you in advance for the help!

Upvotes: 0

Views: 60

Answers (2)

Paul
Paul

Reputation: 141917

args[0].Length is the length of your string. Since strings are 0 indexed, the length is one index past the last character in the string.

If you want to loop in reverse through a string, you should start your iterator at Length - 1.

Upvotes: 1

Mike Precup
Mike Precup

Reputation: 4218

for(int i = args[0].Length; i >= 1; i--)

should be

for(int i = args[0].Length - 1; i >= 0; i--)

Upvotes: 3

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