/***************************************************************************
 ***   FILE: fio.cpp
 *** AUTHOR: Daniel Dementiev
 ***   DATE: Nov 14, 2003
 ***  DESCR: This file is short example of file inpup output for text fiels.
 ***         It takes two file names as arguments, reads the complete
 ***         contents of the first file, counts the number of letters 'a'
 ***         and the number of all other character, and print the result
 ***         on the screen abd into the other file.
 ***         Example:
 ***         c:> fio input.txt output.txt
 ***************************************************************************/

#include <iostream>
#include <fstream>
using namespace std;

void main(int argc, char *argv[])
{
	ifstream inp;
	ofstream out;
	char     ch;
	int      a_cnt=0, o_cnt=0;

	if( argc > 1 ){
		inp.open(argv[1]);
		if( inp.fail() ){
		   cerr<<"Error: cannot open file '"<<argv[1]<<"' for reading.\n";
		   exit(1);
		}
		cout<<"Reading from file '"<<argv[1]<<"' ...";
		inp.get(ch);
		while( ! inp.eof() ){
			if( ch == 'a' ) a_cnt++;
			else o_cnt++;
			inp.get(ch);
		}
		inp.close();
		cout<<"\b\b\b[done]\n"
		    <<"Symbol 'a' encountered "<<a_cnt<<" times\n"
		    <<"Other symbols - "<<o_cnt<<" times"<<endl;
	}

	if( argc > 2 ){
		out.open(argv[2], ios_base::out);
		if( out.fail() ){
		   cerr<<"Error: cannot open file '"<<argv[1]<<"' for writing.\n";
		   exit(2);
		}
		out<<"Symbol 'a' encountered "<<a_cnt<<" times\n"
		   <<"Other symbols - "<<o_cnt<<" times"<<endl;
		out.close();
	}
}