Introduction Converting a string to upper case is a common requirement in C++ programming. Whether you need to compare strings without considering the case or simply want to display text in uppercase, there are a few methods you can use to achieve this. In this tutorial, we will explore a simple and efficient method to convert a string to uppercase in C++. First, let’s start with a basic example: #include <iostream> #include <string> #include <cctype> int main() { std::string str = ""hello world""; // Convert the string to uppercase for (char& c : str) { c = std::toupper(c); } // Print the converted string std::cout << str << std::endl; return 0; } In the above code, we include the necessary headers <iostream>, <string>, and <cctype> for string manipulation and character conversion....