Rounding to Hundreths

I have a little program that calculates the bill of burgers, cokes, etc. but I want to round the tax so that it doesn't go 4 places (only 2 like $).

Now, that may be simple, but I would prefer that if there are any digits after the hundreths, it automatically goes up:

$0.4109 --> $0.42

Hope you can help.

Thanks

Use the ceil function in math.h

Code:

---

#include <stdio.h>
#include <math.h>

int main ( ) {
    double p = 3.4109;
    p = ceil( p * 100 ) / 100;
    printf( "%.2f\n", p );
    return 0;
}

---

I don't have the math.h library. Should I?

This being C++, maybe its called
#include <cmath>

If you have neither, you have a seriously broken compiler - it's supposed to be a standard feature.

OK, I found it. It's there, I just mistyped the #include before. But now that I found the math.h library, I need to initialize printf. Should I just do so and make it 0 at the top?

That subject line was the new error before I tried to initialize printf. I realize that it's a function, but it ain't workin

or use cout, since this is C++

Beautiful, man! How did you figure that out? I looked at that ceil function, but I still can't see how it's different than the others in the math.h library.

Another side question: Can you use images for outputs like in BASIC? Basically, I want to line up the decimals so it doesn't look funny if the bill is $100, while the tax is $7.

Thanks again