Thread: input from the user/exception handling

exceptions are overkill for this....
instead look into cin.good() cin.fail() and cin.clear().
cin.bad() can be useful too.

another strategy is to get all input as a string and then parse that string.Slower but efficiency probably not so important here.

As Stoned Coder has pointed out if all you want to do is this, then exceptions would be pointless. If you're want to use exceptions for different types of input throughout your program and it's larger than a few functions/classes, then you could create an exception class -

Code:

#include <iostream>

using namespace std;

class InputError
{
	static char* errors[];
public:
	static char* reterror(int i){
		//error checking required
		return errors[i];
	}
};

//add more errors
char* InputError::errors [] = {"you'll have to input an integer....."};

int main()
{
	try
	{
		int i;
		cin >>i;
		if(cin.fail())throw InputError::reterror(0);
	}	
	catch(char* err)
	{
		cout << err << endl;
	}
}

besides more tragic problem with doing that way is you cannot recover back to where you asked for the input whereas with either of my strategies you can.

void clearstream(istream& is)
{
is.clear();
while(is.get() != '\n'&& !is.eof())continue;
is.clear();
}

something like that should do it.....

alternatively there is always cin.ignore()