再谈迭代器C++ Primer 11.3

针对习题11.18，巩固了本小节的知识

#include <iostream>
#include <iterator>
#include <vector>
#include <fstream>
#include <algorithm>

using namespace std;

int main(int argc, char** argv)
{
	if (argc !=4)
	{
		throw runtime_error("The input files are error! ");
	}

	ifstream inFile;
	ofstream oddFile;
	ofstream evenFile;
	inFile.open(argv[1]);
	oddFile.open(argv[2]);
	evenFile.open(argv[3]);

	if (!inFile || !oddFile || !evenFile)
	{
		throw runtime_error("Can't open the input file ! ");
	}
	istream_iterator<int>  in_iter(inFile), eof;
	ostream_iterator<int> out_odditer(oddFile, " ");
	ostream_iterator<int> out_eveniter(evenFile, "\n");
	while (in_iter != eof)
	{
		*out_odditer ++= *in_iter++;
		*out_eveniter ++= *in_iter++;
	}
	oddFile.close();
	evenFile.close();

	return 0;
}

当输入文件如图所示：

其得到的两个输出文件内容如图所示：