C++ on number input only

[STR9GNh0]

i tried, do while, while and etc..

i can't just simply input numbers (any int numbers). if not numbers, cin, prompt to re-enter again.

i even tried isDigit still not good to go.

eg..

int num;

do
{
    cin >> num;
}while (num != 0);

any help would be appreciated

[wolfgang]

Does this work?

int num;
while (1)
{
  cin >> num;
  if (num == 0)
    break; 
}

Make sure you are not entering any chars like commas or periods.

[STR9GNh0]

nope, not working

[3hM2Nwbp]

This should work
* Edit * - reference link: http://www.cplusplus.com/reference/iostream/istream/

#include <iostream>

int main()
{
	int value;
	std::cout << "Enter 0-9" << std::endl;
	std::cin >> value;
	while(std::cin.fail())
	{
		std::cout << "Invalid Entry\nEnter 0-9" << std::endl;
		std::cin.clear();
		std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
		std::cin >> value;
	}
	std::cout << "Entered: " << value << std::endl;
        return 0; //Edit # 2 - Forgot my return !
}

[some random dude]

One of the last things he shows here might be what you are looking for:

http://www.youtube.com/watch?v=0e1ia9wfPnQ

[STR9GNh0]

thanks Luc Lieber

it works.. but eg, if i entered 11a it will register the 11 in it.

[some random dude]

Posting this to tell you that I didn't copy the right url, I edited in the right one into my reply :P

[Janlan]

#include <iostream>
using namespace std;

int main ()
{
	bool intEntered = false;
	char input[255] ;
	int number;

	do{
	cout<<"Input numbet: ";
	cin >> input;
	string s = input;
	number = atoi(s.c_str());
	if ( number == 0 )
	cout << "Null is not alowed :) ";
	else
		intEntered = true;

	}while(!intEntered);
}

Here dude... :)))

[Bazzy]

http://www.cplusplus.com/forum/articles/6046/