Ch4.Q1.Drill

[mwaddell]

Please explain how I can filter the "|" character value and terminate. I think the rest of the code is right, but filter a non int type such as '|' makes no sense. If I enter in '|' the program will not store this in type int.

Q: 1. Write a program that consists of a while-loop that (each time around the loop) reads in two ints and then prints them. Exit the program when a terminating '|' is entered.

#include"../../std_lib_facilities.h"

int main()
{
	int val1 = 0;
	int val2 = 0;

	cout << "Please enter two integer values.\n";
	while (cin >> val1 >> val2)
	{
		cout << val1 << " " << val2<<'\n';
		
	}
	return 0;
}

[coder777]

Currently any non numeric value will end the loop (because cin returns false in that case). The invalid character will remain in the stream. If you clear the error (cin.clear();) you can read what caused it, e.g.:

	cout << "Please enter two integer values.\n";
	while (cin >> val1 >> val2)
	{
		cout << val1 << " " << val2<<'\n';
		
	}
	cin.clear();
	std::string str;
	getline(cin, str);

	cout << "End: " << str <<'\n';

[keskiverto]

You could have continued discussion in the previous thread: http://www.cplusplus.com/forum/beginner/188321/

Presumably the operation must continue until a proper terminating character is found. That means a loop. By line 11 of coder777's example we know whether the "inner loop" was interrupted by '|' in the input.
If no, we should restart from line 1. If yes, the "outer loop" can quit/break.

A do while seems intuitive as the outer loop, doesn't it?