C++ floating point accuracy in while loops

Question

I am trying to count the amount of dollar and coin denominations in a grand total by using a series of while loops. When I get down to the coins however, I am off by a penny. Wh

Answer 1

Here's the fixed code, I used TJD's advice and instead of using .01 i used .0099 instead. For my problem that seems to work, thanks guys!

    #include 
using namespace std;

int main()

{
   float amount;
   cout<<"enter amount" << endl;
   cin>>amount;
   int pennies=0, nickels=0, dimes=0, quarters=0, ones=0, fives=0, 
tens=0, 
twenties=0, fifties=0, hundreds=0;
   float p = .0099, n = .0499, d = .099, q = .2499;   
   while (amount >= 100) 
   {
      hundreds = hundreds +1;
      amount = amount - 100;

   }
   while (amount >= 50)
   {
      fifties = fifties +1;
      amount = amount - 50;

   }
   while (amount >= 20)
   {
      twenties = twenties +1;
      amount = amount - 20;

   }
   while (amount >= 10)
   {
      tens = tens +1;
      amount = amount - 10;

   }
   while (amount >= 5)
   {
      fives = fives +1;
      amount = amount - 5;

   }
   while (amount >= 1)
   {
      ones = ones +1;
      amount = amount - 1;

   }
   while (amount >= q)
   {
      quarters = quarters +1;
      amount = amount - q;

   }
   while (amount >= d)
   {
      dimes = dimes +1;
      amount = amount - d;

   }
   while (amount >= n)
   {
      nickels = nickels +1;
      amount = amount - n;

   }
   while (amount >= p)
   {
      pennies = pennies +1;
      amount = amount - p;

   }


   cout<