Outputting a bool to the Console-CodePudding

This is an easy question I think :-)

Have a look at this program:

string v1 = "Hallo";
string v2 = "Hallo";

Console.WriteLine("Output"   v1 == v2);

This just outputs the following:

False

But if I write:

Console.WriteLine("Output"   true);

It outputs:

OutputTrue

I would think that "v1 == v2" evualuates to "true" and is therefore the same. But I am obviously wrong.

Can anyone explain this behaviour to me? I expected to get the same result (OutputTrue) in both cases. What is happening in the first case?

CodePudding user response：

It firsts adds v1 to "Output" so you'll get the following statement:

Console.WriteLine("OutputHallo" == v2);

To fix this you can add parenthisis:

Console.WriteLine("Output" (v1 == v2));

CodePudding user response：

Reference types are checked whether same references point to the same object in memory, not the value itself.

Although string is a reference type, the equality operators (== and !=) are defined to compare the values of string objects, not references. This behavior is overridden for strings in c#. https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/reference-types