c62.cpp

《C++程序设计习题及解答》配套代码VC版

// c62.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <fstream.h>
#include <ctype.h>

// c62 ../readme.txt text.txt

int main(int argc, char* argv[])
{
	if ( argc != 3 )
	{
		cout << "Usage: " << argv[0] << " <source> <target>\n";
		return -1;
	}

	ifstream in( argv[1] );
	if ( !in )
	{
		cout << "Cannot open input file";
		return -1;
	}

	ofstream out( argv[2] );
	if ( !out )
	{
		cout << "Cannot open output file";
		return -1;
	}

	char ch;
	while ( !in.eof() )
	{
		ch = in.get();
		if ( islower( ch ) )
			ch = toupper( ch );
		else
			ch = tolower( ch );
		out.put( ch );
	}

	return 0;
}