Thread: Making sure only one data type is inputted

Hi, im new to c++ and im trying to better myself..

i am trying to make a simple calculator and wanted to be able to make sure the user only can enter a int at some points and double at others. I've tried a few different If statements however they haven't worked so far. Here's some of my code

Code:

int quad()
{
.. .. //local variables
.. .. double a,b,c,d,e,f,g;
.. .. 
.. .. char cLoop;








//function
.. .. do {cout << "This is the page for the quadratic formula (aX2+bX+c)";
.. .. cout << "\n Please enter a: ";
.. .. cin >> a;                                         //Want it to check here
.. .. cout << "\n Please enter b: ";
.. .. cin >> b;
.. .. cout << "\n Please enter c: ";
.. .. cin >> c;
.. .. d = pow(b,2) - 4 * a * c;
.. .. if (d < 0)
.. .. .. .. {
.. .. .. .. .. .. cout << "\nNo Real Roots!";
.. .. .. .. }
.. .. else if (d = 0)
.. .. .. .. {
.. .. .. .. .. .. cout << "One Real Root: ";
.. .. .. .. .. .. e = -b + ((sqrt(d)) / 2 * a);
.. .. .. .. .. .. cout << "\n Your Root Is" << e;
.. .. .. .. }
.. .. else
.. .. .. .. {
.. .. .. .. .. .. cout << "Your Roots Are: ";
.. .. .. .. .. .. f = -b + ((sqrt(d)) / 2 * a);
.. .. .. .. .. .. g = -b - ((sqrt(d)) / 2 * a);
.. .. .. .. .. .. cout << "\nX = " << f;
.. .. .. .. .. .. cout << "\nX = " << g;
.. .. .. .. }
.. .. .. .. cout << "Do you wish to do this again? Y or N.\n";
.. .. .. .. cin >> cLoop;




.. .. } while (cLoop == 'Y' || cLoop == 'y');




.. .. return 0;
}

thanks for any help.