tolower – Tarik Billa

Why can’t “transform(s.begin(),s.end(),s.begin(),tolower)” be complied successfully?

November 28, 2023 by Tarik

Let’s look at a list of options starting with the worst and moving to the best. We’ll list them here and discuss them below: transform(cbegin(s), cend(s), begin(s), ::tolower) transform(cbegin(s), cend(s), begin(s), static_cast<int(*)(int)>(tolower)) transform(cbegin(s), cend(s), begin(s), [](const unsigned char i){ return tolower(i); }) The code in your question, transform(s.begin(), s.end(), s.begin(), tolower) will produce an error … Read more

Do I need to cast to unsigned char before calling toupper(), tolower(), et al.?

September 22, 2023 by Tarik

Yes, the argument to toupper needs to be converted to unsigned char to avoid the risk of undefined behavior. The types char, signed char, and unsigned char are three distinct types. char has the same range and representation as either signed char or unsigned char. (Plain char is very commonly signed and able to represent … Read more

Convert String To camelCase from TitleCase C#

January 14, 2023 by Tarik

You just need to lower the first char in the array. See this answer Char.ToLowerInvariant(name[0]) + name.Substring(1) As a side note, seeing as you are removing spaces you can replace the underscore with an empty string. .Replace(“_”, string.Empty)

How to convert an instance of std::string to lower case

September 6, 2022 by Tarik

Adapted from Not So Frequently Asked Questions: #include <algorithm> #include <cctype> #include <string> std::string data = “Abc”; std::transform(data.begin(), data.end(), data.begin(), [](unsigned char c){ return std::tolower(c); }); You’re really not going to get away without iterating through each character. There’s no way to know whether the character is lowercase or uppercase otherwise. If you really hate … Read more