C++ Primer 8.3

8.3.cpp

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

using namespace std;

void capitalize_all(string & text);

int main()
{
  string text;

  cout << "Enter a string (q to quit): ";
  getline(cin, text);
  if ("q" == text) {
    cout << "Bye." << endl;
    return 0;
  }
  capitalize_all(text);
  cout << text << endl;
  while (true) {
    cout << "Next string (q to quit): ";
    getline(cin, text);
    if ("q" == text) {
      cout << "Bye." << endl;
      return 0;
    }
    capitalize_all(text);
    cout << text << endl;
  }

  return 0;
}

void capitalize_all(string & text)
{
  for (int i = 0; i < text.size(); i++) {
    text[i] = toupper(text[i]);
  }
}