Thread: Question on purchase and change program

I'm trying to write this program that asks for the purchase amount, the payment amount and then outputs the change in the number of bills and coins. I think I'm missing an 'if' statement for determining the coins. Can someone point me in the right direction with this? Thanks. Here is the code:

Code:

#include <stdio.h>

  int main()

   {

     double p,t;
     int coins,bills,change;
     int twenties,tens,fives,ones,quarters,dimes,nickels,pennies;

     char answer [2];

    do

     {

        printf("\nEnter the purchase amount:");
        scanf ("%lf",& p);

        printf("\nEnter the payment amount:");
        scanf ("%lf",& t);

         change=p-t;
         
         bills=(int) change;

          twenties=bills/200;

          bills=bills%200;

          tens=bills/100;

          bills=bills%100;

          fives=bills/50;

          bills=bills%50;

          ones=bills/10;

          bills=bills%10;

         coins=(int)((change-bills)*100);

          quarters=coins/25;

          coins=coins%25;

          dimes=coins/10;

          coins=coins%10;

          nickels=coins/5;

          coins=coins%5;

          pennies=coins;

   printf("\nYour change will be %d twenties, %d tens, %d fives, %d ones, %d quarters, %d dimes, %d nickels and %d pennies.\n",twenties,tens,fives,ones,quarters,dimes,nickels,pennies);

        printf("\nContinue? (Y/N):");
        scanf ("%s",&answer);

     }

    while ((answer[0]=='y') || (answer [0]=='Y'));

  return 0;

   }