Very Computer

I made this simple little program, but when I run it nothing happens.

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#include <stdio.h>

main( )
{
 printf("Hello world.");

Quote:}

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then I compiled it, and that works, because I get an executable file:

  cc -o hello hello.c

But when I run it, it does NOTHING, and I am back at the command prompt.

Surely something simple is worng.

Your systems stdlib seems a little flaky.

You have forgot the trailing '\n' whicg causes your program to
write a new-line. The newline itself might be used by the stdlib
to actually transport the characters to your display.

Normally a program that terminates with character still in the output buffer
would get them displayed. Your system won't.

Keep up with the programming !

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Network Management AB     Fax   +46 031 779 7844
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Hello Matt,

        The reason that you are not seeing any output is that printf()
buffers its output until either a new line "\n" is output or you call
fflush(stdout)

        If you change your print line to either of:

                printf("Hello World.\n");

or

                printf("Hello World.");
                fflush(stdout);

they you should see "Hello World." printed on the the console.

- Rob

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Quote:>    The reason that you are not seeing any output is that printf()
> buffers its output until either a new line "\n" is output or you call
> fflush(stdout)

>    If you change your print line to either of:

>            printf("Hello World.\n");

> or

>            printf("Hello World.");
>            fflush(stdout);

This is true, but actually the standard requires that when a
program exit()'s, it should flush the stdio buffers.  "Falling off"
the end of main constitutes an implicit call to exit() which
should result in "Hello World." being printed without a new
line.  The original poster's system really is a little buggy,
as another poster pointed out.  One might see what happens
if one puts in an explicit call to exit(0) or return(0) at
the end of the program.

Later, you get to learn the difference between exit() and _exit().
On a UNIX platform, you can use _exit() if you *don't* want
the stdio buffers flushed.  This is sometimes useful with
fork().  Well, lots of fun toy to play with! :-)

Best wishes,
  Mike

Hallo,
just try to use a different name for your program. 'test' is a shell
intrinsic. And of course, append a newline.
Alois

--

___________________________________________________________________________

Alois Steindl,                  Tel.: +43 (1) 58801 / 32558
Inst. for Mechanics II,         Fax.: +43 (1) 58801 32598
Vienna University of Technology,

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try
# ./hello
in stead of
# hello