A program that prompts the user for keywords belonging to C++.

[Jason Heyes]

This is a revised version of a post entitled "Class to support keywords".
Please reply to this post instead of the old one.

The following program repeatedly prompts the user for C++ keywords until
'explicit' is entered. If the user fails to enter a valid keyword, the
program terminates.

#include <iostream>
#include "KeyWord.h"

int main()
{
KeyWord word;
while (std::cin >> word && word != "explicit");
return 0;
}

The following two lines of input will terminate the program:

do for while explicit
if else elseif virtual instanceof

The input given by the string "public private switch" will not.

What would a class that supports the functionality of KeyWord in the above
program look like? What are the details of the implementation of such a
class? How many changes to the implementation would be required if another
set of keywords was to be used instead?

I would appreciate help in the form of code as well as discussion. Thanks.

[BigBrian]

Do your homework yourself.

[Christian Meier]

"Jason Heyes" <ja********@optusnet.com.au> schrieb im Newsbeitrag
news:42**********************@news.optusnet.com.au ...

This is a revised version of a post entitled "Class to support keywords".
Please reply to this post instead of the old one.

The following program repeatedly prompts the user for C++ keywords until
'explicit' is entered. If the user fails to enter a valid keyword, the
program terminates.

#include <iostream>
#include "KeyWord.h"

int main()
{
KeyWord word;
while (std::cin >> word && word != "explicit");
return 0;
}

The following two lines of input will terminate the program:

do for while explicit
if else elseif virtual instanceof

The input given by the string "public private switch" will not.

What would a class that supports the functionality of KeyWord in the above
program look like? What are the details of the implementation of such a
class? How many changes to the implementation would be required if another
set of keywords was to be used instead?

I would appreciate help in the form of code as well as discussion. Thanks.

You do not really need a class for that. The whole thing you need is a
container containing strings. The container has to be filled at startup.
Afterwards you can use a find function which tells you if the keyword is in
the container. If not, it is an invalid keyword...
I don't know if there is a class for this thing. But write your own one. I'm
sure there are many listings on the web the all reserved c++ keywords.

Greets Chris

[Thomas Matthews]

Jason Heyes wrote:

This is a revised version of a post entitled "Class to support keywords".
Please reply to this post instead of the old one.

The following program repeatedly prompts the user for C++ keywords until
'explicit' is entered. If the user fails to enter a valid keyword, the
program terminates.

#include <iostream>
#include "KeyWord.h"

int main()
{
KeyWord word;
while (std::cin >> word && word != "explicit");
return 0;
}

The following two lines of input will terminate the program:

do for while explicit
if else elseif virtual instanceof

The input given by the string "public private switch" will not.

What would a class that supports the functionality of KeyWord in the above
program look like? Probably, something with a hardcoded table of strings. Could be
a hash table, a map or something else {from the Dragon Book}.
What are the details of the implementation of such a
class? Depends on the design.
How many changes to the implementation would be required if another
set of keywords was to be used instead? Only to the table.

I would appreciate help in the form of code as well as discussion. Thanks.

--
Thomas Matthews

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