Silly Question

[mlukas]

Hello,

I'm new to this form and new to C programming. I'm starting to work my way through Kernighan and Ritchie's book, but I am having trouble getting some of their examples to work. For instance when I compile and run:

#include <stdio.h>

main()
{
long nc;

nc = 0;
while (getchar() != EOF)
++nc;
printf("%1d\n", nc);
}

This program is suppose to count the number of characters, but when I run it and type: the+enter, nothing happens. Even if I let c = getchar() etc., still nothing happens. I'm using the lcc-win32 IDE.

Thanks,
Mike

[sicarie]

mlukas-

Welcome to theScripts!

I'm betting your issue is coming from your while condition.

EOF in C/C++ is actually a character. You can find out what it is on your compiler by printing it, but my point is that you cannot input an EOF character with the keyboard. Try changing it to a letter, ie

while (getchar() != 'a')

and then running it (not pressing a - or whatever character you used - until you want to exit).

[Banfa]

I'm betting your issue is coming from your while condition.

EOF in C/C++ is actually a character. You can find out what it is on your compiler by printing it, but my point is that you cannot input an EOF character with the keyboard.

CTRL-Z (ASCII 26) is the normal end of line character and you can input it from the keyboard (by press control and Z and the same time :D ) if you run the program and give this input

the<Enter>
<CTRL-Z><enter>

Then the program correctly outputs the the value 4, the number of characters that appear before the CTRL-Z.

However that is a ratrher convoluted way to get keyboard input and using a normal character (I would have chosen newline '\n') is probably a better option.

[sicarie]

CTRL-Z (ASCII 26) is the normal end of line character and you can input it from the keyboard (by press control and Z and the same time :D ) if you run the program and give this input

the<Enter>
<CTRL-Z><enter>

Then the program correctly outputs the the value 4, the number of characters that appear before the CTRL-Z.

However that is a ratrher convoluted way to get keyboard input and using a normal character (I would have chosen newline '\n') is probably a better option.

I did not know that. Thanks Banfa.

[JosAH]

Hello,

I'm new to this form and new to C programming. I'm starting to work my way through Kernighan and Ritchie's book, but I am having trouble getting some of their examples to work. For instance when I compile and run:

#include <stdio.h>

main()
{
long nc;

nc = 0;
while (getchar() != EOF)
++nc;
printf("%1d\n", nc);
}

This program is suppose to count the number of characters, but when I run it and type: the+enter, nothing happens. Even if I let c = getchar() etc., still nothing happens. I'm using the lcc-win32 IDE.

Thanks,
Mike

Does the front cover of your Kernighan & Ritchie copy mention "Ansi" or "2nd
edition" somewhere? If not, you have a very old copy of their book.

kind regards,

Jos