C++ primer(第五版） 练习 3.17 个人code

#include <string>
#include <iostream>
#include <cctype>
#include <vector>

using std::string;
using std::cout;
using std::cin;
using std::endl;
using std::vector;

int main()
{
vector<string> words;
string key;

while (cin>>key)
{
words.push_back(key);
}
for (unsigned i = 0; i !=words.size(); i++)
{
for (unsigned b = 0; b != words[i].size(); b++)
{

words[i][b] = toupper(words[i][b]);

}
}
for (auto &c : words)
cout << c<< endl;

return 0;

}