15

Cletters

  1. #include <iostream>
  2. #include <cstdio>
  3.  
  4. #if 0
  5. #include <cctype>
  6. #endif
  7.  
  8. int main()
  9. {
  10.     int i;
  11.     int cnt[ 26 ];  // 26 letters
  12.     char c;
  13.  
  14.     // init counters
  15.     for ( i = 0; i < 26; i++ )
  16.         cnt[ i ] = 0;
  17.  
  18. #if 0
  19.     // read stdin
  20.     while ( (c = std::cin.get()) != EOF )
  21.         // count letters (using char types)
  22.         if ( isalpha( c ) )
  23.             cnt[ toupper(c) - 'A' ]++;
  24. #endif
  25.  
  26.     // read stdin
  27.     while ( (c = std::cin.get()) != EOF )
  28.         // count letters (more efficient)
  29.         if ( c >= 'a' && c <= 'z' )
  30.             cnt[ c - 'a' ]++;
  31.         else if ( c >= 'A' && c <= 'Z' )
  32.             cnt[ c - 'A' ]++;
  33.  
  34.     // print counters
  35.     for ( i = 0; i < 26; i++ )
  36.         std::cout << char('A'+i) << "=" << cnt[ i ] << std::endl;
  37. }

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