How to egalise two strings
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Cedric Moonen wrote:
How do you know that ??
I suspect he made an assumption based on the fact the code was using the '==' operator to attempt the comparison, but could obviously be wrong.
Jonathan Wilkes Darka[Xanya.net]
I think the OP was using the == operator with char pointers and that's why it didn't work.
Cédric Moonen Software developer
Charting control [v1.2] -
because he asked a question related 2 posts below ;P check this[^]
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If somebody is motivated to understand that, i have tried to regroup and order the programme. I hope you will help me.
#include #include using namespace std; #include #include #include #include #include int main() { // Openning the flow : fstream list; list.open("listfile.txt",ios::in); // Decalaration of the variables: char t; int i; string s1; string s2; string s3; string s4; string s5; string s6; string s7; string s8; string s9; string s10; string s11; //Getting the name of the files: getline(list,s1);cout<tm_mday <<"-" << date->tm_mon + 1 <<"-" << date->tm_year + 1900 << ".txt"; //Declaration of the variables: int a1=0; int a2=0; int a3=0; int a11=0; int a4=0; int a5=0; int a6=0; int a7=0; int a8=0; int a9=0; int a10=0; char c; char t1; char t2; char t3; char t11; char t4; char t5; char t6; char t7; char t8; char t9; char t10; char f; // Opening clippr´ flow: fstream clippr; clippr.open("clippr.txt",ios::in); // Opening the files´ flow : fstream fichier1; fichier1.open(s1.c_str(),ios::in); fstream fichier2; fichier2.open(s2.c_str(),ios::in); fstream fichier3; fichier3.open(s3.c_str(),ios::in); fstream fichier11; fichier11.open(s11.c_str(),ios::in); fstream fichier4; fichier4.open(s4.c_str(),ios::in); fstream fichier5; fichier5.open(s5.c_str(),ios::in); fstream fichier6; fichier6.open(s6.c_str(),ios::in); fstream fichier7; fichier7.open(s7.c_str(),ios::in); fstream fichier8; fichier8.open(s8.c_str(),ios::in); fstream fichier9; fichier9.open(s9.c_str(),ios::in); fstream fichier10; fichier10.open(s10.c_str(),ios::in); // Getting the file lines: string c1;string c2; string c3; string f1;string f2; string f3; getline(clippr,c1); getline(clippr,c1);cout< -
Hello, I would like to compare two strings: i used:
if (s1==s2) {I have no problem to compile, but even when s1=s2 it doesnt work... -
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If somebody is motivated to understand that, i have tried to regroup and order the programme. I hope you will help me.
#include #include using namespace std; #include #include #include #include #include int main() { // Openning the flow : fstream list; list.open("listfile.txt",ios::in); // Decalaration of the variables: char t; int i; string s1; string s2; string s3; string s4; string s5; string s6; string s7; string s8; string s9; string s10; string s11; //Getting the name of the files: getline(list,s1);cout<tm_mday <<"-" << date->tm_mon + 1 <<"-" << date->tm_year + 1900 << ".txt"; //Declaration of the variables: int a1=0; int a2=0; int a3=0; int a11=0; int a4=0; int a5=0; int a6=0; int a7=0; int a8=0; int a9=0; int a10=0; char c; char t1; char t2; char t3; char t11; char t4; char t5; char t6; char t7; char t8; char t9; char t10; char f; // Opening clippr´ flow: fstream clippr; clippr.open("clippr.txt",ios::in); // Opening the files´ flow : fstream fichier1; fichier1.open(s1.c_str(),ios::in); fstream fichier2; fichier2.open(s2.c_str(),ios::in); fstream fichier3; fichier3.open(s3.c_str(),ios::in); fstream fichier11; fichier11.open(s11.c_str(),ios::in); fstream fichier4; fichier4.open(s4.c_str(),ios::in); fstream fichier5; fichier5.open(s5.c_str(),ios::in); fstream fichier6; fichier6.open(s6.c_str(),ios::in); fstream fichier7; fichier7.open(s7.c_str(),ios::in); fstream fichier8; fichier8.open(s8.c_str(),ios::in); fstream fichier9; fichier9.open(s9.c_str(),ios::in); fstream fichier10; fichier10.open(s10.c_str(),ios::in); // Getting the file lines: string c1;string c2; string c3; string f1;string f2; string f3; getline(clippr,c1); getline(clippr,c1);cout<very bad thing to post a huge block of code and tell to anyone to see what's wrong with it... you must post relevant samples, and try to understand which are the incriminated lines. and use your debugger if you can
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pourquoi tu le prend comme ca ? je le signalais juste à celui qui te répondait que son code ne marche que si ce sont des char*, pas des strings :~
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pourquoi tu le prend comme ca ? je le signalais juste à celui qui te répondait que son code ne marche que si ce sont des char*, pas des strings :~
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pourquoi tu le prend comme ca ? je le signalais juste à celui qui te répondait que son code ne marche que si ce sont des char*, pas des strings :~
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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. :)
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OK, ragazzi, ora, rilassatevi...:-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.
uhh, sorry, i don't understand much italian ! lol
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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. :)
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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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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uhh, sorry, i don't understand much italian ! lol
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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:
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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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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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...:((
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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...:((
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 compilers1.operator==(s2)(calling then the functionbool 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 theoperator !=. 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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Hello, I would like to compare two strings: i used:
if (s1==s2) {I have no problem to compile, but even when s1=s2 it doesnt work... -
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. :)