count.cpp

// C++ Primer Plus example list 17.17
//count.cpp -- counting characters in a list of files
#include <iostream>
#include <fstream>
#include <cstdlib>    //for exit()

int main(int argc, char* argv[])
{
	using namespace std;

	if (argc == 1)       //quit if no argument
	{
		cerr << "Usage: " << argv[0] << " filename[s]\n";
		exit(EXIT_FAILURE);
	}

	ifstream fin;            //open stream
	long count;
	long total = 0;
	char ch;

	for (int file = 1; file < argc; file++)
	{
		fin.open(argv[file]);    //connect stream to argv[file]

		if (!fin.is_open())
		{
			cerr << "Could not open " << argv[file] << endl;
			fin.clear();
			continue;
		}

		count = 0;

		while (fin.get(ch))
			count++;

		cout << count << " characters in " << argv[file] << endl;
		total += count;
		fin.clear();      //needed for some implementations
		fin.close();
	}

	cout << total << " characters in all files\n";

	return 0;

}