// CountChars.cpp

#include <iostream>
#include <fstream>
#include <iomanip>
#include <cctype>

using namespace std;

int main( int argc, char* argv[] )
{
	// check number of arguments
  	if ( argc < 2 )
    {
    	cerr << "Missing argument." << endl;
      	cerr << "usage: CountChars filename" << endl;
      	return 1;
    }

  	// open streams
  	ifstream lReader;

  	lReader.open( argv[1] );
  	if ( lReader.fail() )
    {
    	cerr << "Cannot open file \'" << argv[1] << "\'." << endl;
      	return 1;
    }

    // setup count array
    int chars[26][2];
    
    for ( int i = 0; i < 26; i ++ )
    {
    	chars[i][0] = 0;
    	chars[i][1] = 0;
    }
    
    // read and count chars
    char lChar;
    
    while ( lReader >> lChar )
    	if ( isalpha( lChar ) )
    		chars[(int)(toupper( lChar ) - 'A')][isupper( lChar ) ? 0 : 1]++;	
    
    // print counts
    
    cout << "Character counts for " << argv[1] << ": " << endl;
    for ( int i = 0; i < 26; i++ )
		cout << (char)('A' + i) << ": " << chars[i][0] << "\t " <<
			(char)('a' + i) << ":" << chars[i][1] << "\t= " <<
			chars[i][0]+chars[i][1] << endl;
		
	lReader.close();
	return 0;
}