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Convert a String In C++ To Upper Case
Hi, I need a portable function to convert string in c++ to upper case. I'm now using toupper( char); function. Is it a standard function? If not, what it's the correct way to do it across platforms? Btw, is there any web / wiki where I can list all c++ standard functions? Thank you.
Yes, toupper is declared in the cctype header. You can transform a string with an algorithm:
#include <algorithm> #include <iostream> #include <string> #include <cctype> int main() { std::string str("hello there"); std::cout << str << '\n'; std::transform(str.begin(), str.end(), str.begin(), std::toupper); std::cout << str << '\n'; } 
For the latter question, there's http://www.cplusplus.com/.
Hi in our project we use boost/algorithm/string to_upper function project for windows and linux
