C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  string + string          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Gary Wessle Guest Posted: Sat Dec 16, 2006 10:10 am    Post subject: string + string Hi any idea why I am getting something like main.cpp:177: error: invalid operands of types ‘const char [11]’ and ‘const char [8]’ to binary ‘operator+’ when trying to compile something like int main(int argc, char* argv[]) { string a = ".........." + "......."; cout << a << endl; } how can I solve this, I have few lines and use + to concatenate them together. thanks Back to top Default User Guest Posted: Sat Dec 16, 2006 10:10 am    Post subject: Re: string + string Gary Wessle wrote: Quote: Hi any idea why I am getting something like main.cpp:177: error: invalid operands of types ‘const char [11]’ and ‘const char [8]’ to binary ‘operator+’ when trying to compile something like int main(int argc, char* argv[]) { string a = ".........." + "......."; cout << a << endl; } There's not a std::string operator + that take two char pointers. Quote: how can I solve this, I have few lines and use + to concatenate them together. std::string a = "......."; a += "....."; Brian Back to top Salt_Peter Guest Posted: Sat Dec 16, 2006 10:10 am    Post subject: Re: string + string Gary Wessle wrote: Quote: Hi any idea why I am getting something like main.cpp:177: error: invalid operands of types 'const char [11]' and 'const char [8]' to binary 'operator+' when trying to compile something like int main(int argc, char* argv[]) { string a = ".........." + "......."; cout << a << endl; } how can I solve this, I have few lines and use + to concatenate them together. thanks You think the above is concatinating literal strings but its actually attempting to add their pointers. Which is not allowed (obviously) when constructing the std::string. try: std::string a = ".........."; a += "......."; or better: std::string sline1(10, '.'); std::string sline2(5, '.'); std::cout << sline1 << " title " << sline2 << std::endl; Back to top Gianni Mariani Guest Posted: Sat Dec 16, 2006 10:10 am    Post subject: Re: string + string Gary Wessle wrote: Quote: Hi any idea why I am getting something like main.cpp:177: error: invalid operands of types ‘const char [11]’ and ‘const char [8]’ to binary ‘operator+’ when trying to compile something like int main(int argc, char* argv[]) { string a = ".........." + "......."; string a = string("..........") + "......."; Quote: cout << a << endl; } how can I solve this, I have few lines and use + to concatenate them together. There is no : string operator+( const char *, const char * ) Back to top Jack Klein Guest Posted: Sat Dec 16, 2006 10:11 am    Post subject: Re: string + string On 16 Dec 2006 16:54:40 +1100, Gary Wessle <phddas (AT) yahoo (DOT) com> wrote in comp.lang.c++: Quote: Hi any idea why I am getting something like main.cpp:177: error: invalid operands of types ‘const char [11]’ and ‘const char [8]’ to binary ‘operator+’ when trying to compile something like int main(int argc, char* argv[]) { string a = ".........." + "......."; cout << a << endl; } how can I solve this, I have few lines and use + to concatenate them together. In addition to Gianni's answer, there is one thing you can do that only works for string literals in source code, namely leave out the '+'. The code: string a = "abc" "def" "ghi"; ....produces exactly the same result as: string a = "abcdefghi"; And so does this: string a = "abc" "def" "ghi"; String literals that are separated by nothing but white space are concatenated by the preprocessor when compiling. -- Jack Klein Home: http://JK-Technology.Com FAQs for comp.lang.c http://c-faq.com/ comp.lang.c++ http://www.parashift.com/c++-faq-lite/ alt.comp.lang.learn.c-c++ http://www.contrib.andrew.cmu.edu/~ajo/docs/FAQ-acllc.html Back to top Jim Langston Guest Posted: Sat Dec 16, 2006 10:11 am    Post subject: Re: string + string "Gary Wessle" <phddas (AT) yahoo (DOT) com> wrote in message news:m31wn0peqn.fsf (AT) localhost (DOT) localdomain... Quote: Hi any idea why I am getting something like main.cpp:177: error: invalid operands of types 'const char [11]' and 'const char [8]' to binary 'operator+' when trying to compile something like int main(int argc, char* argv[]) { string a = ".........." + "......."; cout << a << endl; } how can I solve this, I have few lines and use + to concatenate them together. thanks As explained, you are actually trying to add two char pointers. A few ways around: std::string a = "......"; a += "....."; or std::string a = std::string("...........") + "............"; Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         C++Talk.NET Forum Index -> C++ language (comp.lang.c++) All times are GMT Page 1 of 1   Jump to: Select a forum C/C++----------------C LanguageC Language (Moderated)C++ Language (Moderated)C++ language (comp.lang.c++)C++ language, library and standards Non-English C/C++ Newsgroups----------------C++ (German)C++ (French)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.