for the following code snippet:
int k;
char c;
while (true)
{
k = Console.Read ();
if (k == -1) break;
c = (char) k;
Console.WriteLine ("Echo: {0}", c);
}
Console.WriteLine ("Done");
jljkj
Echo: j
Echo: l
Echo: j
Echo: k
Echo: j
Echo:
Echo:
so this is result after I typing "jljkj" then "enter" in the console in XP.
What is going on here!? I just don't understand the program's performance?
Read() is suppose to read in a character? or a stream!? But even it can read
in a stream, how can it separates the character in the stream and print them
out separately according to code above!? I am new to C#. Thanks for your
help!!! 4 4492
Henry <He***@discussions.microsoft.com> wrote: for the following code snippet:
int k; char c; while (true) { k = Console.Read (); if (k == -1) break; c = (char) k; Console.WriteLine ("Echo: {0}", c); } Console.WriteLine ("Done");
jljkj Echo: j Echo: l Echo: j Echo: k Echo: j Echo: Echo:
so this is result after I typing "jljkj" then "enter" in the console in XP. What is going on here!? I just don't understand the program's performance? Read() is suppose to read in a character? or a stream!? But even it can read in a stream, how can it separates the character in the stream and print them out separately according to code above!? I am new to C#. Thanks for your help!!!
It reads a character at a time, but it only gets to see anything after
you've hit enter. If you're using C# 2.0, you can use Console.ReadKey
instead.
--
Jon Skeet - <sk***@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
Thank you very much Jon, you answer makes sense, but why at the end, it
echoes twice of the "enter"? I just don't get it. Thanks a lot!
And in MSDN reference, it says:
Return Value
The next character from the input stream, or negative one (-1) if no more
characters are available.
How do I enter a "-1" in the console? Thanks a lot!
"Jon Skeet [C# MVP]" wrote: Henry <He***@discussions.microsoft.com> wrote: for the following code snippet:
int k; char c; while (true) { k = Console.Read (); if (k == -1) break; c = (char) k; Console.WriteLine ("Echo: {0}", c); } Console.WriteLine ("Done");
jljkj Echo: j Echo: l Echo: j Echo: k Echo: j Echo: Echo:
so this is result after I typing "jljkj" then "enter" in the console in XP. What is going on here!? I just don't understand the program's performance? Read() is suppose to read in a character? or a stream!? But even it can read in a stream, how can it separates the character in the stream and print them out separately according to code above!? I am new to C#. Thanks for your help!!!
It reads a character at a time, but it only gets to see anything after you've hit enter. If you're using C# 2.0, you can use Console.ReadKey instead.
-- Jon Skeet - <sk***@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet If replying to the group, please do not mail me too
Henry <He***@discussions.microsoft.com> wrote: Thank you very much Jon, you answer makes sense, but why at the end, it echoes twice of the "enter"? I just don't get it. Thanks a lot!
That's the carriage return and the line feed. Print out the key as a
number instead of a character (just don't do the cast - leave it as an
int) and you'll see what I mean.
And in MSDN reference, it says: Return Value The next character from the input stream, or negative one (-1) if no more characters are available.
How do I enter a "-1" in the console? Thanks a lot!
You don't, from an interactive console. If you run something like:
test < foo.txt
you'll find that you get to the end of the input stream at the end of
the file.
--
Jon Skeet - <sk***@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
Thank you so much john, you are really an expert:) I have tried, and the
first one is (13) which is a carriage returen, then second one is (10) which
is he NewLine feed
BTW: in fact you can enter a (-1) from the console, which is Ctrl + z
Thanks again!
"Jon Skeet [C# MVP]" wrote: Henry <He***@discussions.microsoft.com> wrote: Thank you very much Jon, you answer makes sense, but why at the end, it echoes twice of the "enter"? I just don't get it. Thanks a lot!
That's the carriage return and the line feed. Print out the key as a number instead of a character (just don't do the cast - leave it as an int) and you'll see what I mean.
And in MSDN reference, it says: Return Value The next character from the input stream, or negative one (-1) if no more characters are available.
How do I enter a "-1" in the console? Thanks a lot!
You don't, from an interactive console. If you run something like:
test < foo.txt
you'll find that you get to the end of the input stream at the end of the file.
-- Jon Skeet - <sk***@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet If replying to the group, please do not mail me too This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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