util/charstat.cpp

   1 #include <map>
   2 #include <iostream>
   3 #include <iomanip>
   4 #include <algorithm>
   5 #include <sstream>
   6 #include <cctype>
   7 #include <clocale>
   8 #include <cstdlib>
   9
  10 typedef std::map< char, unsigned > freq_type;
  11
  12 class print: public std::unary_function< freq_type::value_type, void >
  13 {
  14         std::ostream& os;
  15 public:
  16         unsigned total;
  17         print(std::ostream& out, unsigned total) : os(out), total(total) {}
  18         void operator() (const freq_type::value_type& p)
  19         {
  20                 os.fill('0');
  21                 os.width(8);
  22                 os << p.second << ": ";
  23                 os.width(4);
  24                 os.fill(' ');
  25                 if (isgraph(p.first)) {
  26                         os << p.first;
  27                 } else {
  28                         std::ostringstream oss;
  29                         oss << "0x";
  30                         oss.width(2);
  31                         oss.fill('0');
  32                         oss.setf(std::ios::hex, std::ios::basefield);
  33                         oss << int(p.first);
  34                         os << oss.str();
  35                 }
  36                 os << " (" << double(p.second) / total * 100 << "%)\n";
  37         }
  38 };
  39
  40 int main(void)
  41 {
  42         std::setlocale(LC_ALL, "es_AR");
  43         char c = 0;
  44         unsigned total = 0;
  45         std::map< char, unsigned > freq;
  46         while (std::cin.get(c)) {
  47                 ++freq[c];
  48                 ++total;
  49         }
  50         for_each(freq.begin(), freq.end(), print(std::cout, total));
  51         return 0;
  52 }
  53