Listing 9-7 extracted from chapter Fundamental concepts of the language

Listing 9-6<     > Listing 9-8

This listing can be compiled with the command line:
csc.exe /target:exe Example_9_7.cs
Errors: 3 Warnings: 0

class Program {
   public static void Main() {
      #line 1 "Method Main()"
      int i == 0;  // <- ERROR : Not allowed to use the operator '=='
                   //            in this context!
   }
}