FAQ: Method Output - Out

#1

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This community-built FAQ covers the “Out” exercise from the lesson “Method Output”.

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#2

Here’s my answer

using System;

namespace OutParameters
{
  class Program
  {
    static void Main(string[] args)
    {
      string ageAsString = "102";
      string nameAsString = "Granny";
      
      int ageAsInt;
      bool outcome;
      outcome = Int32.TryParse(ageAsString, out ageAsInt);
      
      Console.WriteLine(outcome);
      Console.WriteLine(ageAsInt);
      
      int nameAsInt;
      bool outcome2;
      outcome2 = Int32.TryParse(nameAsString, out nameAsInt);
      
      Console.WriteLine(outcome2);
      Console.WriteLine(nameAsInt);
    }  
  }
}
#3

So should Granny be null or 0 when printing
Console.WriteLine(nameAsInt);
?

#4

int cannot be null unless made nullable (int?). So it will have to have a value that isn’t null. The default for int is 0, so it will be 0.

#5

Oh ok thanks. I’m guessing the narrative may be wrong for this section. It has example code saying:

int number2;
bool success2 = Int32.TryParse(" !!! ", out number2);
// number2 is null and success2 is false

but number 2 would be 0 not null right?

#6

Yes, it would be 0 not null.

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