Lecture4code.txt

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/*
 *  File: lecture.cpp
 *  ------------------
 * Snippets from the live coding part of Wed 1/16 lecture
 * showing some simple use of fstream.
 */

#include "genlib.h"
#include <iostream>
#include <fstream>
#include "simpio.h"

int CountLines(ifstream &in)
{
	int count = 0;
	while (true) {
		string line;
		getline(in, line);
		if (in.fail()) break;
		count++;
	}
	return count;
}


int main()
{
	ifstream in;
	while (true) {
		cout << "Enter name: ";
		string s = GetLine();
		in.open(s.c_str());
		if (!in.fail()) break;
		cout << "Couldn't open file, try again!" << endl;
		in.clear();
	}
	cout << "Num lines = " << CountLines(in) << endl;
	return 0;
}

Lecture4code.txt

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