ws.cpp

(plain text) 
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#include <iostream>
#include <sstream>
#include <string>
#include <cctype>

namespace Sentence {
  inline std::string fix (const std::string &s) {
    std::istringstream istr(s);
    std::string sentence;
    sentence.reserve(s.size());

    for (std::string word; istr >> word; sentence += word) {
      if (sentence.empty())
	word[0] = std::toupper(word[0]);
      else
	sentence += ' ';
    }

    if (*sentence.rbegin() != '.') sentence += '.';

    return sentence;
  }
};

int main () {
  std::cout << Sentence::fix("   this is a test of the     emergency broadcast     system    ") << std::endl;
  std::cout << Sentence::fix("   this is a test of the     emergency broadcast     system.    ") << std::endl;
}