### making change in dollars project question

closed account (EAXiz8AR)
Hello I'm working on this problem where the user inputs an amount of money between \$0.00 and \$19.99, and the program outputs the best way to calculate the change of that amount. So for example, if I put in "\$9.94", then the program should output

One \$5 bill
4 \$1 bills
3 quarters
1 dime
1 nickel
4 pennies

I started doing this:

 ``123456789101112131415161718192021`` ``````float x; cout << "Input a dollar amount between 0.00 and 19.99 inclusive: "; cin >> x; cout << "Change of " << x << " is best given as: " << endl; if (x > 10.00) { cout << "One \$10 bill" << endl; } else if (5.00 < x && x <= 9.99) { cout << "Two \$5 bills" << endl; } else if (0.00 < x && <= 5.00) { cout << "Three \$5 bills" << endl; } ``````

but I feel like its really inefficient and am wondering if you guys can point me in the right direction as to how to make this program. I can't think of a way to use loops in this, but if there is a way, will you let me know?

Yes that is very inefficient.. and it will require much more coding than a simpler alternative.

1) Use variables. Make a variable that counts how many of each bill/coin you need.

2) Use division (/) and mod (%) operators to easily find out how many coins you need. Note that mod only works with integers, so I could multiply by 100 to get rid of that floating point.

hint:

This should require exactly zero if statements. You should be able to do it all with math.
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closed account (EAXiz8AR)
ok thanks

how would you implement the multiplying 100 part? Like for example, if I wanted to find the number of 10 dollar bills it had to use,

`tenDollar = total*100 % 10*100`

like that?
Last edited on
I suggest writing a class that stores Money in ints.

class Money
{
int mDollars;
unsigned int mCents;

// then fill in the required methods for manipulating this data.
};
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