You right I don't know about parsing..
but I am writting here to get some help and maybe you can lead me on how to
parse..
if you could learned it, so could I.
so can you just give me an example or some guidelines here please.
Thanks John..
----- Original Message -----
From: "John Harrison" <john_andronicus@hotmail.com>
Newsgroups: comp.lang.c++
Sent: Sunday, July 13, 2003 3:08 PM
Subject: Re: Truth Table help
[color=blue]
>
> "PerritoPerron" <peter@aol.tv> wrote in message
> news:3giQa.72214$hV.4603213@twister.austin.rr.com. ..[color=green]
> > //I need a little help with this program, it runs but the output is not
> > correct.
> > //Can i get some help here please u fellas???
> >
> > // This Program asks for user input like 1 && 0 and prints if it is true[/color]
> or[color=green]
> > false
> > // it calculates the input to perform Logical operation from input
> >
> > #include <iostream>
> > using namespace std;
> >
> > // Defines class
> >
> > class Myclass{
> > public:
> > int func();
> > };
> >
> > // Function to perform operation
> >
> > int Myclass::func(){
> >
> > char x[32] = ""; // array to receive input
> >
> > cout << "\n\t\t\t T R U T H T A B L E\n" // asks for input
> > << "\t\t\t ========= =========\n\n"
> > << "Logical operators allow us to form more complex test[/color][/color]
expressions\n"[color=blue][color=green]
> > << "for decision and repetition statements. The logical operators
> > are:\n\n"
> > << "1. && (logical and)\n"
> > << "2. || (logical or)\n"
> > << "3. ! (logical not)\n\n"
> > << "Please enter 1 for true, 0 for false with a logical operator\n"
> > << "Parentheses may be used to alter the order in which operators are
> > applied.\n"
> > << "Example:\n"
> > << "1 && 0 or 1 || 0 ";
> >
> > cin.getline(x, 32, '\n'); // stores input in variable called x
> >
> > cout << bool (x) << endl; // prints out true or false value
> >[/color]
>
>
> You need to learn how to write a parser. This is not a quick or easy
> operation. Do not expect a one line solution like bool(x), we're talking
> maybe 40 lines of code, depending on how sophisticated you want to get.[/color]
You[color=blue]
> need to analyse the input data character by character and make choices[/color]
based[color=blue]
> in the input you find.
>
> To be perfectly honest this seems far too difficult for you at your[/color]
current[color=blue]
> level of ability, but if you really want to know how find a book on[/color]
parsing[color=blue]
> and study. For instance Stroustrup has a parser in chapter 6 'The C++
> Programming Language', or Avo Sethi and Ullman in chapter 2 of 'Compilers,
> Principles, Techniques and Tools'
>
>[color=green]
> >
> > return 0;
> > }
> >
> > // Main function invokes perform operation function
> >
> > int main(){
> > Myclass mc;
> > mc.func();
> > return 0;
> > }
> >[/color]
>
> john
>
>[/color]
