How to egalise two strings

Lost User

Oula je ne suis pas du tout enervé, choqué, ou autre. Je bois les paroles de tous ceux qui postent un message sur ce forum car je n´ai a mon actif ke 30h de langage c++. Je n´y connais pas grand chose. :) Je suis actuellement en stage et je dois realiser ce programme. Cela fait maintenant une semaine que je suis dessus, et je sens qu´il est tout près d´aboutir. Désolé si ma réponse a pu paraitre sèche, ce n´etait pas du tout l´esprit du message. C´est l´effet message ecrit qui ne transcrit pas le ton de la voix. :)

toxcct

uhh, sorry, i don't understand much italian ! lol

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toxcct

ok, let's continue in english now. you still didn't answered a question of mine... what, for you, is the difference between equalize and compare 2 strings ?

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Lost User

to me, compare is looking at 2 objects and see if they are equal or not. egalise a and b is a=b (change the value of a or b so that it is equal to the other value) is it clear :doh:

CPallini

Oh, pardon, I assumed it was a multi-ethnic thread... :-D

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.

toxcct

ok, i get what's your problem then... you are trying to speak english with french words ;P don't say equalize but assign. anyway, as you're using std::strings, just use the = operator for this, and == operator to compare their content.

std::string s1 = "Hello";
std::string s2 = "World";

ASSERT(s1 != s2); // the objects contain different strings

s1 = s2; //Assign s2 content into s1
ASSERT(s1 == s2); // the objects contain same strings

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Lost User

OK, just to see if i have caught what you said: I should use == to compare if string s1 has the same content with string s2. That´s it? Because I already have tried that and it doesn´t work...:((

Lost User

Hum ... i did a mistake while typing the code, i always typed: if(s1==s2) but the thing i wanted to check is if (s1!=s2) I am so sorry for the loss of time.... :| Anyway, thank you very much for your help!!!

toxcct

garfaoui wrote:

I should use == to compare if string s1 has the same content with string s2. That´s it?

exactly. but be careful, the operator must be the overload of std::string class. in the expression s1 == s2, if s1 is of type std::string, the code actually means to the compiler s1.operator==(s2) (calling then the function bool std::string::operator==(const std::string&)). but if s1 is a basic C-Style string (a char* basically), the compiler will try to compare the addresses, not the string contents... the context is exactly the same while using the operator != . so, can you please post a relevant (but small) piece of code which can reproduce the error ? also, specify to us the type of all the variables used, and which error you get (if it is a compiler error, linker error, or run-time error), and its message.

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