07-string-upper.cpp

// 07-string-upper.cpp : function to make a std::string uppercase in-place

import std;
using namespace std;

void string_to_uppercase(string &s) {
    for (auto& c : s) {
        c = toupper(c);
    }
}

int main() {
    cout << "Please enter some text in lower-, mixed- or upper-case:\n";
    string input;
    getline(cin, input);
    string_to_uppercase(input);
    cout << "The same text in uppercase is:\n" << input << '\n';
}