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Games like Everquest let you input your own questions, and NPC's answer to certain keywords. Aka...
You type:
"Where can I get this legendary sword?"
He answers by the keyword "legendary sword"..
"You can find it in the mountains north of here, but I warn you, do not go alone. No one has returned on this dangerous task."
Can you do that with cin >> at all? And what method would you use?
Use string, and the getline function:
To math patterns in the string, though, you'll have to use some complex coding, or something like a regular expression library. I believe Boost has one of those ( www.boost.org ).Code:#include <iostream>
#include <string>
int main( )
{
std::string str;
std::getline(cin, str, '\n');
}
There's no ansi way of doing it?
string and getline are in the standard namespace for a reason.Quote:
Originally posted by Darkman
There's no ansi way of doing it?
gg
And Boost is largely based on ANSI C++ and provides both POSIX and Windows implementations where not.
Thought that was part of your signature for some reason...Quote:
Originally posted by Zach L.
To math patterns in the string, though, you'll have to use some complex coding, or something like a regular expression library. I believe Boost has one of those ( www.boost.org ).
you could do it with getline and find strings.
something like this
yeah i know there is a little bit of redundance with the comparee thing, but i couldnt find a way around it.Code:#include <iostream>
#include <string>
using namespace std;
int main()
{
string say, compared= "legendary sword";
unsigned int comparee = say.find(compared, 0);
cout << "hail" << endl;
getline(cin,say);
// that way the reply will automaticaly become the say
comparee = say.find(compared, 0);//establish what its looking for
if(comparee != string::npos ) //make it look for the key word
{
cout << "You can find it in the mountains north of here ";
cout << "but I warn you, do not go alone. ";
cout << "No one has returned on this dangerous task." << endl;
//i seperated it like this to keep it easyer to look
//at the code w/o mesing with the H-scroll
}
cin.get();
return 0;
}
I would tokenize the string, and search word by word, and use the best match. for example, at a shop:of course, that won't work when somebody types like this:Code:user: I want to buy a legenday sword
merchant: you have to go to the mountains
words found: buy legendary sword
user: I want to sell this stupid legendary sword
merchant: I will buy it for 789456786189 platinum
words found: sell legendary sword
if you really wanted to get deeply into it, you can do it in stages... liek this:Quote:
i dwaont to biy lgendarie sord
it would probably be easier to set something up like this:Code:user: i want to buy a sword
merchant: what kind of sword are you looking for?
words found: buy sword
user: I want to buy a sword with short range
merchant: I have a short sword for 1564 silver
words found: buy sword short
have the user whisper it to the merchant or soemthing... or just say it while in range of the merchant...Code:user: /merchant buy short sword
merchant: that short sword will cost you 45619. buy?
user: /merchant no
thats if you are going to go to a merchant, and are going to talk to them, i prefer either a list of what he has, or a user interface with a the items and words.
but thats only for a text based game, UI's are better imo.Code:user: /buy
merchant: i have:
1) a rusty short sword - 1 silver
2) a jaged short sword - 5 silver
3) an iron short sword - 2 gold
4) a steal short sword - 4 gold
5) a fine alloy short sword - 5 platinum
user: /buy 3
merchant: you dont have 2 gold.
user /buy 2
merchant: thank you for your buisness
you have 5 less silver
you have 6 silver less
Thanks, Aal. I tried your code and it worked tremendously. Thanks everyone. By your opinion, do you think this will be used in later future games? I noticed they did with a few RPG's. It seemed more real to me for some reason. Maybe the fact that I can roleplay what my character says instead of clicking "Background," "Latest Rumors," etc.
Like I was trying to say earlier, the main thing that holds that back is that not everybody speaks (types) full english the way you want, for example: a computer doesn't know that "i want to purchase" means "Can i buy"
but a programer does, and can put "purchase", "buy", and even a few miss spellings for "purchase" :p
Could it be possible to divide all the words of the string and then check them one by one with a for loop?
(I learned the very basics of programming with a game called Graal, and you could use tokenize to take parts of strings)
Yes
What you know about a phrase is that each word is seperated by a space.
So you take this fact and use it too your advantage.
you could use a vector or an array or another contairer to hold it. i gona use an array but i'd suggest using a vector as it solves the problem of dynmic memory allocation for you, but you could use an array and do some dynamic stuff.
Alright so that would break it up into individual words, After that you jsut have to check it for what you need.Code:...
string userIn;
char wordArray[6][5]; // i know my inpputed phrase has 6 words and longest word is 5 letters
int x, y, z;
x= 0; y = 0; z = 1;
// user says this "I want to buy a sword."
cin >> userIn;
char currentLetter = userIn[0];
while (currentLetter) {
if (currentLetter != "." && currentLetter !=" ") {
wordArray[x][y] = currentLetter;
y++;
}
if (currentLetter == " ") { // your moving onto another word.
x++;
y = 0;
}
currentLetter = userIn[z];
z++;
}
NOte this is untested code and is realy ment jsu tto give you an idea of how you might be able to solve your problem.
Search the web for "natural language parsers." Many MUDs have very complex input parsers nowadays that let you do things like:
> get the first green sword in the 2nd wood crate
> sell it to bob
Everquest's system is actually very, very simple. It could be easily copied with simple code like the following:
And a sample run:Code:#include <iostream>
#include <string>
#include <map>
class Responder
{
public:
std::string sayto(std::string msg)
{
std::map<std::string, std::string>::iterator itr = responses.begin();
for( ; itr != responses.end(); ++itr)
{
if(msg.find(itr->first) != std::string::npos)
return itr->second;
}
return "I do not understand.";
}
void add_response(std::string key, std::string resp)
{
responses[key] = resp;
}
private:
std::map<std::string, std::string> responses;
};
int main()
{
Responder r;
r.add_response("hail", "Hello traveller! Hrm, now where did I put those [rusty swords]?");
r.add_response("rusty sword", "Bring me rusty swords and I'll give you a [prize]!");
r.add_response("prize", "Shh! I can't tell you abou that!");
std::cout << "Type 'hail' to start and 'quit' to quit." << std::endl;
std::string s;
do
{
std::cout << "Say what? " << std::flush;
std::getline(std::cin, s);
if(s != "quit")
{
std::string response = r.sayto(s);
std::cout << "Bob says, '" << response << "'" << std::endl;
}
} while(s != "quit");
return 0;
}
$ ./a.out
Type 'hail' to start and 'quit' to quit.
Say what? hail
Bob says, 'Hello traveller! Hrm, now where did I put those [rusty swords]?'
Say what? What rusty swords are you talking about?
Bob says, 'Bring me rusty swords and I'll give you a [prize]!'
Say what? Wow?! What type of prize?
Bob says, 'Shh! I can't tell you abou that!'
Say what? quit
$
Hope that helps.
-tf
For tokenizing and looping through the tokens, the boost tokenizer is very well suited.
Not bad. Where can I learn more about these strings?
yeah, if you want to create a large library file, which takes time to search...Quote:
Originally posted by Aalmaron
but a programer does, and can put "purchase", "buy", and even a few miss spellings for "purchase" :p
get "C++ programing in easy steps". its got a whole chapter devoted to them. its a great book for only $10. vary nice for referance.Quote:
Originally posted by Darkman
Not bad. Where can I learn more about these strings?
sold.