Thread: Not a float

What i am trying to do is to set a value for a. the value should be a number (float).

but i need to make it so that if a char is entered, then the program will end, or say something like "this is incorrect. please try again".

this is a sample of my code. if u need more please ask.

Code:

cout << "Please enter the value for a, the lower bound  ";
cin >> a;

now, if i put a number in there it'll carry on doing whatever it does. but if i put a letter in, i'd like it to stop. so what's the way of saying

"if a is not a flaot then.....

http://faq.cprogramming.com/cgi-bin/...&id=1043284392

Code:

#include <limits>

/* *** CODE HERE *** */

std::cout << "Please enter the value for a, the lower bound  ";
while(!(cin >> a))     // If the stream fails from bad input
{
   std::cin.clear();             // Clear the fail state
   std::cin.ignore(std::numeric_limits<streamsize>::max(), '\n');   // Clear the buffer
   std::cout << "Invalid statement, please re-enter: ";     // Reprompt
}