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Hello and thanks for replying,



I just use a Unix shell and i don't really know what's happening inside the system.

I tried to solve the problem with the zero values by placing a for loop...

Thank you very much for replying.

Well i did all the following:



So, i made some modifications to the program:

1) I first call the times function before i fork().
2) I use the waitpid...

Thanks for replying,

Well something is weird with my program.
Well i removed the following lines with the string "Hello World"
(placed them into comments)



write(fd[1], string,...

Hello,

i'm writing a program in C and i'm trying to implement the function "times".

In my program,i establish a pipeline and afterwards i create a child by using the fork() function.
The child...

Thank you very much!It worked! :)

Could you please give a simple example?because i'm a bit confused!Let's say we have 'w' and we wold like to get its value how do we use divide and modulo ?

Thanks in advance!

after struct my_Expr

Well as i saw in the tab file the struct my_Expr is defined before

/* The semantic value of the lookahead symbol. */
YYSTYPE yylval;

well when i do make this is what happens:

flex lex.l...

Everything looks fine in the tab file.Well, the problem is that Lex and Yacc were working fine but when i tried to add the new struct in the %union the compiler didn't accept it. I had googled the...

What i would like also to mention is that when i do int exprValue,or char *exprValue it is compiled fine, the problem is when i use a struct!!!

Well the code is a bit confusing, i'm trying to make a parser for a compiler.

i have the parser.y program which is like that:




%{

#include <stdio.h>

Wow really quick reply!Thanks a lot!

Well i have two types of versions

a)gcc (GCC) 3.4.2
Copyright (C) 2004 Free Software Foundation, I

b)gcc (GCC) 4.1.3 20080114 (prerelease) (Debian...

Hello to all,

i have a shell and i use gcc in order to compile my programs.Can anyone tell me if there is any command which can tell me what kind of version of gcc i use?

Thanks in advance! :)

Yeah, thanks a lot!
It worked! :)

Good morning to all!

I have a program and i'm trying to use itoa but i get the following error :

Undefined first referenced
symbol in file...

Hi, thanks for replying!

It works and i get a warning: pointer type mismatch in conditional expression but it's ok cause the program runs now!!!

Do you know what i shall do in order not to have...

Hello, i have made an array of pointers and i have filled the array with NULL values in every index

When i'm trying to print the value of each cell/index i do:

printf("%s\n",array[i]); and i...

Hello to all

i have a union in Yacc (parser.y) like that :



&#37;union {

int intValue;
char *stringValue;

I'm trying to link the parser and the scanner together and i get the following:
Does anybody know what do i do wrong?

#gcc -o hello scanner.c parser.c
Undefined first...

Well you were right, I had forgotten a ';' in a previous definition/declaration of a struct.
Thank you!!!

Well i have already done that and it doesn't work, if you see a link referring to %unions in Yacc a ';' is not needed.

Thanks for replying!

Hello to all,

I 'm trying to make a compiler.I have already made the lexical analyzer and the parser and i'm trying to link them together. When i link them , i get the error :

parser.y:28:...

Hi to all!

I have made a yacc program example.y




%{

#include <stdio.h>

Hi to all!

I want to make a hash table using a hash function.

I do:




#include<stdio.h>