The output is:

False
True

Why? When comparing two objects, the equality operator (==) checks to see if the objects are exactly the same object (i.e. the same reference) and not two different instances of objects. In the first comparison, to compiler creates two different objects of type int. So, even though the value in each object is the same, the object a and the object b are different objects. So the comparison of these two different instances is False.

In the second comparison, the output is True because c and d refer to string literals. In C#, hard-coded strings with the same value (c = 10, d=10), don't necessarily result in a new string instance being created. A C# compiler in .NET uses something called an intern pool which contains a single reference to each unique literal string declaration in your system. So every time you reference the same string literal, you get a reference to the same string. So the comparison of two objects containing the same literal string results in True.

• Link to C Strings Tutorial
• Link to C++ Strings Tutorial
• Link to C# Strings Tutorial