C++ -- Convert string to upper/lower case

To convert an std::string to upper case you can use the following:

#include <algorithm>
#include <string>
…
std::string data = “Abc”;
std::transform(data.begin(), data.end(),
data.begin(), ::toupper);

For converting to lower case, you need to replace ::toupper with ::tolower.

Other C/C++ not so frequently asked questions.

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