Can you compare function return's in a 'while' loop?

Tarts · 08-04-2003, 04:00 PM

Hi! I wonder if i can compare two(if two then i can do more) function return's
in a while loop. Example:

Code:

while (!(scanf("%s", password) && (strcpy(password, crypt(password, salt)) 
	{				   
		if (strcmp(password, read) < 0 || strcmp(password, read) > 0)
		{
			hold(2);
			printf("\nPassword incorrect\n");
			printf("Password:");
	        }
        }

kev82 i know your in the forum now, if you see this don't mind the 'scanf()', i'll be getting rid of it. i must find out if i can do this, if i can...COOL! The above won't compile, but instead give's me a large cascade of error's, which has to be the while loop above, i don't want to see corrected code, but instead would just like to know if i can do it.
Thank's for any reply's.

Stuka · 08-04-2003, 04:05 PM

That's definitely doable - what kind of errors is it giving you?

Tarts · 08-04-2003, 04:11 PM

Error's i can't list because i can't copy the info from konsole in KDE, buuuut
that's all the info i needed anyway, COOOOOOL, and thank's.
{Edit}
Here's the error's.

Code:

[Mirrus][karensmith][04:22:08[/Source][$] gcc login3.c -lcrypt -o /Exec/login3
login3.c: In function `main':
login3.c:53: parse error before `{'
login3.c:55: parse error before `{'
login3.c: At top level:
login3.c:60: parse error before `}'
login3.c:61: parse error before `2'
login3.c:61: conflicting types for `hold'
login3.c:27: previous declaration of `hold'
login3.c:61: warning: data definition has no type or storage class
login3.c:62: parse error before string constant
login3.c:66: warning: parameter names (without types) in function declaration
login3.c:66: conflicting types for `free'
/usr/include/stdlib.h:538: previous declaration of `free'
login3.c:66: warning: data definition has no type or storage class
login3.c:67: parse error before `-'
login3.c:67: conflicting types for `exit'
/usr/include/stdlib.h:577: previous declaration of `exit'
login3.c:67: warning: data definition has no type or storage class
login3.c:69: warning: parameter names (without types) in function declaration
login3.c:69: warning: data definition has no type or storage class
login3.c:70: parse error before `return'
[Mirrus][karensmith][04:22:38[/Source][$]

They don't make sense, i've seen reaction's like this before when doing some funky if statement's, but the rest of the code is solid, i believe it's the while loop. Thank's.

kev82 · 08-04-2003, 04:30 PM

Quote:

kev82 i know your in the forum now, if you see this don't mind the 'scanf()', i'll be getting rid of it.

LOL, anything that helps you learn is very good i was only talking about a final product in the other thread.

the error appears to be a missing ) on the line with the while on it, or rather an extra ( before the strcpy. vim and emacs bracket matching is a wonderful thing.

Tarts · 08-04-2003, 04:39 PM

Quote:

Originally posted by kev82
LOL, anything that helps you learn is very good i was only talking about a final product in the other thread.

Hehe, I must admit my mind can't grasp the thought of a final product in this point in time.

Quote:

the error appears to be a missing ) on the line with the while on it. vim and emacs bracket matching is a wonderful thing.

Ok so there's a solid reason to use vim, 'man vim' i go. Thank's everyone.

Tarts · 08-05-2003, 06:16 PM

kev82, i saw you where in here (lucky for me){edit}(you dissapeared), i can't seem to find the command for bracket matching for vim in ':help', i read the ':help usr_06.txt'
for syntax highlighting, do you just edit the syntax highlighting (?) because i tryed the command ':syntax enable' and the parenthesis where not color coded the way i figured, is that what you mean be bracket matching, color coding?
Thank's for any reply's!

kev82 · 08-05-2003, 06:56 PM

theres no internal vim command to bracket match as far as i know but theres a plugin for it somewhere here: http://users.erols.com/astronaut/vim/index.html

i need to go to sleep - what i meant to say was, if you go over a bracket and press % it will show you the matching bracket, the above should be nicer though.

Tarts · 08-05-2003, 07:03 PM

Thank's for the link!

I'll check it out!

{edit}
I don't want to keep you up

, but is this plugin for 'visual' mode, if it is it's pretty usless to me, i'd rather be able to use 'vim' not in x.
I hope you read this i didn't want to reply to this thread again.
Let me try % in 'vim' out of x and see what happen's.
Thank's.

kev82 · 08-05-2003, 07:36 PM

visual mode is a mode in vim for selecting text and has nothing to do with X it is activated by pressing v in command mode.

the plugin is designed to be used in command mode(where you press x to delete, i to insert, etc) by enabling the plugin \[i as you move over a bracket vim will highlight its matching bracket. the plugin can be disabled by \[s

Tarts · 08-05-2003, 07:50 PM

Got it. Thank's!

moses · 08-06-2003, 12:41 AM

With vi/vim, you can also, in escape mode, use the % key to find the matching bracket of the one your cursor is sittling on.

Tarts · 08-06-2003, 07:24 PM

Vim rock's, for without it i couldn't do somthing:

Code:

while ((!(scanf("%s", password))) || (strcpy(password, crypt(password, salt)) != read) && (strcmp(password, read) != 0))
	{					           
		if (strcmp(password, read) != 0)
		{
			hold(2);
			printf("\nPassword incorrect\n");
			printf("Password:");
		}
        }
	hold(2);

like that. :) :) :)
kev82 unfortunatly i could'nt get the plugin working, i moved into '/usr/share/vim/vim61/plugin' directory, then tryed enabling it with '\[i'
all i got was 'scanf()' declaration at the bottom, which i couldn't tell was a vim feature, or the plugin? But thank's for everything kev82, and all other's.
{edit} '\[i' with or without the plugin show's the function declaration of the function the cursor is sitting on, still cool though.