Thread: Tell me about C/C++

Code:

std::string user_input;
std::cin >> user_input;

found_fuck = user_input.find("fuck");
if (found_fuck != std::string::npos)
{
    std::cout << "omg you swore, you basterd" << std::endl;
}

Firstly what you're trying there won't work. If you want to compare two strings you need to use strcmp() or something. strcmp() is a function that returns the number of characters that are different between two strings. In your example, you could have written
if (!strcmp(userinput, "fuck"))
(don't forget to include string.h/cstring
and it would have worked as you expected.

But in order to search a string containing more than one word, you'd probably have to loop through it and isolate the words (looking for characters that are not letters), and then compare each word against the word you want to detect.

edit: ... Or you can use the built inn find function of the string class, it seems :p

Originally Posted by khh

Firstly what you're trying there won't work. If you want to compare two strings you need to use strcmp() or something. strcmp() is a function that returns the number of characters that are different between two strings. In your example, you could have written
if (!strcmp(userinput, "fuck"))
(don't forget to include string.h/cstring
and it would have worked as you expected.

But in order to search a string containing more than one word, you'd probably have to loop through it and isolate the words (looking for characters that are not letters), and then compare each word against the word you want to detect.

edit: ... Or you can use the built inn find function of the string class, it seems :p

Absolutely not.

Code:

using namespace std;
string in;
cin >> in;
if (in == "fuck"){
   cout << "in == fuck" << endl;
} else if (in.find("fuck") != string::npos){
   cout << "in contains fuck" << endl;
}

strcmp is for char strings, it's C, not C++. The std::string class has == operators for both other strings and char strings.

Originally Posted by ninja9578

strcmp is for char strings, it's C, not C++. The std::string class has == operators for both other strings and char strings.

Well, it's impossible to tell from his post whether he's asking about C or C++ :p

Slash,
rather than asking little questions here
you may be better off looking stuff up in a reference guide
(it'll be quicker, and you'll learn more)

Eg.
Here's the reference for the string class
http://www.cplusplus.com/reference/string/string/

The methods are at the end

Originally Posted by khh

Well, it's impossible to tell from his post whether he's asking about C or C++ :p

C++, he's using cout

Thanks, guys.

And Ynot, I never noticed that on the site, that will be very handy. Thanks.

Originally Posted by ninja9578

C++, he's using cout

Ah. Busted.
Oh well, I guess I should only answer questions I'm sure about. Though luckily there's always someone here to inform me when I'm wrong :p

lol, no don't do that. If I correct you then you learn more

Well. I would like to know how Guitarboy is coming along.

So, Guitarboy? Still at it?

Err, not very good at it.
Trying, but failing.

Aww, oh noes What are you stuck on?

I'm not reall quite sure what I should be doing/learning. I'm going to take classes soon (a month, probably) so I'm going to wait until then.

Originally Posted by guitarboy

I'm not reall quite sure what I should be doing/learning. I'm going to take classes soon (a month, probably) so I'm going to wait until then.

You know, the first few problems on http://projecteuler.net/ are actually really easy, and perfect for you to practice if you don't really have anything to practice with.