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  3. So how well do you think you know C#?

So how well do you think you know C#?

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  • L Offline
    L Offline
    leppie
    wrote on last edited by
    #1

    Without compiling the following code, what will be the result, if run?

    class Program
    {
    static void Main(string[] args)
    {
    object r = Foo(true);
    Console.WriteLine(r.GetType());
    Console.ReadLine();
    }

    static object Foo(bool e)
    {
    return e ? 0 : 0.0;
    }
    }

    Now compile and run the code? Are you surprised? If so, try figure it out, if not, then kudos to you :)

    xacc.ide - now with TabsToSpaces support
    IronScheme - 1.0 alpha 4a out now (29 May 2008)

    J B M R S 13 Replies Last reply
    0
    • L leppie

      Without compiling the following code, what will be the result, if run?

      class Program
      {
      static void Main(string[] args)
      {
      object r = Foo(true);
      Console.WriteLine(r.GetType());
      Console.ReadLine();
      }

      static object Foo(bool e)
      {
      return e ? 0 : 0.0;
      }
      }

      Now compile and run the code? Are you surprised? If so, try figure it out, if not, then kudos to you :)

      xacc.ide - now with TabsToSpaces support
      IronScheme - 1.0 alpha 4a out now (29 May 2008)

      J Offline
      J Offline
      Jorgen Sigvardsson
      wrote on last edited by
      #2

      Double I would imagine due to this: return e ? 0 : 0.0;. The thing with this if-expression, is that the true and false types must be of same or assignable types. In this case an int can be cast into a double, but not vice versa. Because of this, the compiler will promote the 0 to a 0.0, hence double.

      L B 2 Replies Last reply
      0
      • L leppie

        Without compiling the following code, what will be the result, if run?

        class Program
        {
        static void Main(string[] args)
        {
        object r = Foo(true);
        Console.WriteLine(r.GetType());
        Console.ReadLine();
        }

        static object Foo(bool e)
        {
        return e ? 0 : 0.0;
        }
        }

        Now compile and run the code? Are you surprised? If so, try figure it out, if not, then kudos to you :)

        xacc.ide - now with TabsToSpaces support
        IronScheme - 1.0 alpha 4a out now (29 May 2008)

        B Offline
        B Offline
        blackjack2150
        wrote on last edited by
        #3

        It's the same as doing

        object x = 2 * 1.0;
        Console.WriteLine(x.GetType());

        which is more obvious.

        L 1 Reply Last reply
        0
        • J Jorgen Sigvardsson

          Double I would imagine due to this: return e ? 0 : 0.0;. The thing with this if-expression, is that the true and false types must be of same or assignable types. In this case an int can be cast into a double, but not vice versa. Because of this, the compiler will promote the 0 to a 0.0, hence double.

          L Offline
          L Offline
          leppie
          wrote on last edited by
          #4

          You people are too smart so early in the morning! ;P

          xacc.ide - now with TabsToSpaces support
          IronScheme - 1.0 alpha 4a out now (29 May 2008)

          J 1 Reply Last reply
          0
          • B blackjack2150

            It's the same as doing

            object x = 2 * 1.0;
            Console.WriteLine(x.GetType());

            which is more obvious.

            L Offline
            L Offline
            leppie
            wrote on last edited by
            #5

            blackjack2150 wrote:

            It's the same as doing

            Not exactly. In you case, the result becomes a double. In my example, the 0 is converted to a double at compile time.

            xacc.ide - now with TabsToSpaces support
            IronScheme - 1.0 alpha 4a out now (29 May 2008)

            1 Reply Last reply
            0
            • L leppie

              You people are too smart so early in the morning! ;P

              xacc.ide - now with TabsToSpaces support
              IronScheme - 1.0 alpha 4a out now (29 May 2008)

              J Offline
              J Offline
              Jorgen Sigvardsson
              wrote on last edited by
              #6

              Smart? Nah, I give experience credit for this. Also, if you think about it, it has to be this way. Numbers aren't that different from objects in OOP. I think this code makes it more apparent: (boolval ? new Car() : new AirPlane()).Fly();Since C# is statically typed, method selection can't be left to runtime binding. :)

              L A 2 Replies Last reply
              0
              • L leppie

                Without compiling the following code, what will be the result, if run?

                class Program
                {
                static void Main(string[] args)
                {
                object r = Foo(true);
                Console.WriteLine(r.GetType());
                Console.ReadLine();
                }

                static object Foo(bool e)
                {
                return e ? 0 : 0.0;
                }
                }

                Now compile and run the code? Are you surprised? If so, try figure it out, if not, then kudos to you :)

                xacc.ide - now with TabsToSpaces support
                IronScheme - 1.0 alpha 4a out now (29 May 2008)

                M Offline
                M Offline
                Mustafa Ismail Mustafa
                wrote on last edited by
                #7

                double, and I'd be surprised if it were anything else...

                Don't forget to vote if the response was helpful


                Sig history "dad" Ishmail-Samuel Mustafa "You're an idiot." John Simmons, THE Outlaw programmer "I realised that all of my best anecdotes started with "So there we were, pissed". Pete O'Hanlon Unix is a Four Letter Word, and Vi is a Two Letter Abbreviation

                S G 2 Replies Last reply
                0
                • J Jorgen Sigvardsson

                  Smart? Nah, I give experience credit for this. Also, if you think about it, it has to be this way. Numbers aren't that different from objects in OOP. I think this code makes it more apparent: (boolval ? new Car() : new AirPlane()).Fly();Since C# is statically typed, method selection can't be left to runtime binding. :)

                  L Offline
                  L Offline
                  leppie
                  wrote on last edited by
                  #8

                  It could have bound to object :|

                  xacc.ide - now with TabsToSpaces support
                  IronScheme - 1.0 alpha 4a out now (29 May 2008)

                  1 Reply Last reply
                  0
                  • M Mustafa Ismail Mustafa

                    double, and I'd be surprised if it were anything else...

                    Don't forget to vote if the response was helpful


                    Sig history "dad" Ishmail-Samuel Mustafa "You're an idiot." John Simmons, THE Outlaw programmer "I realised that all of my best anecdotes started with "So there we were, pissed". Pete O'Hanlon Unix is a Four Letter Word, and Vi is a Two Letter Abbreviation

                    S Offline
                    S Offline
                    Simone Busoli
                    wrote on last edited by
                    #9

                    Extremely useful

                    Simone Busoli

                    M 1 Reply Last reply
                    0
                    • S Simone Busoli

                      Extremely useful

                      Simone Busoli

                      M Offline
                      M Offline
                      Mustafa Ismail Mustafa
                      wrote on last edited by
                      #10

                      in what sense? :confused:

                      Don't forget to vote if the response was helpful


                      Sig history "dad" Ishmail-Samuel Mustafa "You're an idiot." John Simmons, THE Outlaw programmer "I realised that all of my best anecdotes started with "So there we were, pissed". Pete O'Hanlon Unix is a Four Letter Word, and Vi is a Two Letter Abbreviation

                      J 1 Reply Last reply
                      0
                      • M Mustafa Ismail Mustafa

                        in what sense? :confused:

                        Don't forget to vote if the response was helpful


                        Sig history "dad" Ishmail-Samuel Mustafa "You're an idiot." John Simmons, THE Outlaw programmer "I realised that all of my best anecdotes started with "So there we were, pissed". Pete O'Hanlon Unix is a Four Letter Word, and Vi is a Two Letter Abbreviation

                        J Offline
                        J Offline
                        Jorgen Sigvardsson
                        wrote on last edited by
                        #11

                        Your sig... ;)

                        M 1 Reply Last reply
                        0
                        • J Jorgen Sigvardsson

                          Your sig... ;)

                          M Offline
                          M Offline
                          Mustafa Ismail Mustafa
                          wrote on last edited by
                          #12

                          :doh: :laugh:

                          Don't forget to vote if the response was helpful


                          Sig history "dad" Ishmail-Samuel Mustafa "You're an idiot." John Simmons, THE Outlaw programmer "I realised that all of my best anecdotes started with "So there we were, pissed". Pete O'Hanlon Unix is a Four Letter Word, and Vi is a Two Letter Abbreviation

                          1 Reply Last reply
                          0
                          • M Mustafa Ismail Mustafa

                            double, and I'd be surprised if it were anything else...

                            Don't forget to vote if the response was helpful


                            Sig history "dad" Ishmail-Samuel Mustafa "You're an idiot." John Simmons, THE Outlaw programmer "I realised that all of my best anecdotes started with "So there we were, pissed". Pete O'Hanlon Unix is a Four Letter Word, and Vi is a Two Letter Abbreviation

                            G Offline
                            G Offline
                            Gary Wheeler
                            wrote on last edited by
                            #13

                            Mustafa Ismail Mustafa wrote:

                            double, and I'd be surprised if it were anything else...

                            double, and I'd be surprised pissed off if it were anything else... (I'm in the process of learning C#)

                            Software Zen: delete this;

                            M 1 Reply Last reply
                            0
                            • L leppie

                              Without compiling the following code, what will be the result, if run?

                              class Program
                              {
                              static void Main(string[] args)
                              {
                              object r = Foo(true);
                              Console.WriteLine(r.GetType());
                              Console.ReadLine();
                              }

                              static object Foo(bool e)
                              {
                              return e ? 0 : 0.0;
                              }
                              }

                              Now compile and run the code? Are you surprised? If so, try figure it out, if not, then kudos to you :)

                              xacc.ide - now with TabsToSpaces support
                              IronScheme - 1.0 alpha 4a out now (29 May 2008)

                              R Offline
                              R Offline
                              Rajesh R Subramanian
                              wrote on last edited by
                              #14

                              How do you get formatted and colorised code like that? Is there a tool or something? Do you mind sharing it with me? :)

                              Many are stubborn in pursuit of the path they have chosen, few in pursuit of the goal - Friedrich Nietzsche .·´¯`·->Rajesh<-·´¯`·. [Microsoft MVP - Visual C++]

                              L 1 Reply Last reply
                              0
                              • R Rajesh R Subramanian

                                How do you get formatted and colorised code like that? Is there a tool or something? Do you mind sharing it with me? :)

                                Many are stubborn in pursuit of the path they have chosen, few in pursuit of the goal - Friedrich Nietzsche .·´¯`·->Rajesh<-·´¯`·. [Microsoft MVP - Visual C++]

                                L Offline
                                L Offline
                                leppie
                                wrote on last edited by
                                #15

                                Rajesh R Subramanian wrote:

                                How do you get formatted and colorised code like that? Is there a tool or something? Do you mind sharing it with me?

                                xacc.ide*, select text, right click, copy special, copy to HTML :) * see link below

                                xacc.ide - now with TabsToSpaces support
                                IronScheme - 1.0 alpha 4a out now (29 May 2008)

                                R 1 Reply Last reply
                                0
                                • L leppie

                                  Rajesh R Subramanian wrote:

                                  How do you get formatted and colorised code like that? Is there a tool or something? Do you mind sharing it with me?

                                  xacc.ide*, select text, right click, copy special, copy to HTML :) * see link below

                                  xacc.ide - now with TabsToSpaces support
                                  IronScheme - 1.0 alpha 4a out now (29 May 2008)

                                  R Offline
                                  R Offline
                                  Rajesh R Subramanian
                                  wrote on last edited by
                                  #16

                                  It works with C++? Will I be able to specify a background color of my option? I know that I can modify the HTML, but I'm just asking. I'm downloading it at the moment. Thanks.

                                  Many are stubborn in pursuit of the path they have chosen, few in pursuit of the goal - Friedrich Nietzsche .·´¯`·->Rajesh<-·´¯`·. [Microsoft MVP - Visual C++]

                                  L 1 Reply Last reply
                                  0
                                  • R Rajesh R Subramanian

                                    It works with C++? Will I be able to specify a background color of my option? I know that I can modify the HTML, but I'm just asking. I'm downloading it at the moment. Thanks.

                                    Many are stubborn in pursuit of the path they have chosen, few in pursuit of the goal - Friedrich Nietzsche .·´¯`·->Rajesh<-·´¯`·. [Microsoft MVP - Visual C++]

                                    L Offline
                                    L Offline
                                    leppie
                                    wrote on last edited by
                                    #17

                                    Rajesh R Subramanian wrote:

                                    It works with C++?

                                    Not as nice as C#, but ok :)

                                    Rajesh R Subramanian wrote:

                                    Will I be able to specify a background color of my option? I know that I can modify the HTML, but I'm just asking.

                                    Nope, not IIRC, it just defaults to white, I cant remember if it picks up the color from the editor, or if that color can even be changed! Been very long since I wrote that :)

                                    xacc.ide - now with TabsToSpaces support
                                    IronScheme - 1.0 alpha 4a out now (29 May 2008)

                                    R 1 Reply Last reply
                                    0
                                    • L leppie

                                      Rajesh R Subramanian wrote:

                                      It works with C++?

                                      Not as nice as C#, but ok :)

                                      Rajesh R Subramanian wrote:

                                      Will I be able to specify a background color of my option? I know that I can modify the HTML, but I'm just asking.

                                      Nope, not IIRC, it just defaults to white, I cant remember if it picks up the color from the editor, or if that color can even be changed! Been very long since I wrote that :)

                                      xacc.ide - now with TabsToSpaces support
                                      IronScheme - 1.0 alpha 4a out now (29 May 2008)

                                      R Offline
                                      R Offline
                                      Rajesh R Subramanian
                                      wrote on last edited by
                                      #18

                                      I might give it a shot to add those features of my choice if time permits. I hardly work with C#. Thanks for the tool anyways.

                                      Many are stubborn in pursuit of the path they have chosen, few in pursuit of the goal - Friedrich Nietzsche .·´¯`·->Rajesh<-·´¯`·. [Microsoft MVP - Visual C++]

                                      1 Reply Last reply
                                      0
                                      • L leppie

                                        Without compiling the following code, what will be the result, if run?

                                        class Program
                                        {
                                        static void Main(string[] args)
                                        {
                                        object r = Foo(true);
                                        Console.WriteLine(r.GetType());
                                        Console.ReadLine();
                                        }

                                        static object Foo(bool e)
                                        {
                                        return e ? 0 : 0.0;
                                        }
                                        }

                                        Now compile and run the code? Are you surprised? If so, try figure it out, if not, then kudos to you :)

                                        xacc.ide - now with TabsToSpaces support
                                        IronScheme - 1.0 alpha 4a out now (29 May 2008)

                                        S Offline
                                        S Offline
                                        SomeGuyThatIsMe
                                        wrote on last edited by
                                        #19

                                        i say double, but one of our new devs, thought it was a bool, then an object, then gave up and had me explain it. person has the same title as me too, funny how i never cared about that stuff until i got one. hopefully the other new guy will do better.

                                        Please remember to rate helpful or unhelpful answers, it lets us and people reading the forums know if our answers are any good.

                                        1 Reply Last reply
                                        0
                                        • G Gary Wheeler

                                          Mustafa Ismail Mustafa wrote:

                                          double, and I'd be surprised if it were anything else...

                                          double, and I'd be surprised pissed off if it were anything else... (I'm in the process of learning C#)

                                          Software Zen: delete this;

                                          M Offline
                                          M Offline
                                          Mustafa Ismail Mustafa
                                          wrote on last edited by
                                          #20

                                          Gary Wheeler wrote:

                                          double, and I'd be surprised pissed off if it were anything else...

                                          I stand corrected :)

                                          Gary Wheeler wrote:

                                          (I'm in the process of learning C#)

                                          From what I remember, you're a C++er. Don't worry, you'll pick it up in no time flat, but you'll hate some stuff. const comes as a[n unpleasant] surprise and so do reflection issues. All in all, its a nice language :)

                                          Don't forget to vote if the response was helpful


                                          Sig history "dad" Ishmail-Samuel Mustafa "You're an idiot." John Simmons, THE Outlaw programmer "I realised that all of my best anecdotes started with "So there we were, pissed". Pete O'Hanlon Unix is a Four Letter Word, and Vi is a Two Letter Abbreviation

                                          G 1 Reply Last reply
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