大小写字母替换 正确的程序是什么

Question

编写程序，读入一行字符（长度小于1000），将其中出现的小写字母替换为大写字母并输出。

Microsoft Edge is the only browser optimized for Windows.
MICROSOFT EDGE IS THE ONLY BROWSER OPTIMIZED FOR WINDOWS.

Answer 1

#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

int main()
{
    string line;
    getline(cin, line);
    for_each(line.begin(), line.end(), [](auto &c) { c = toupper(c); });
    cout << line << endl;
    return 0;
}

$ g++ -Wall main.cpp
$ ./a.out
Microsoft Edge is the only browser optimized for Windows.
MICROSOFT EDGE IS THE ONLY BROWSER OPTIMIZED FOR WINDOWS.