C++的解题步骤

我的解题步骤

#include <iostream>
#include <string>
#include <cctype>
using namespace std;


int main() {
    string input;
    
    getline(cin, input);
    
    for (char &c : input) {
        if (isupper(c)) {
            c = tolower(c);
        }
    }
    
    cout << input << endl;
    
    return 0;
}