double trouble

[John C]

> I believe the problem is with my scaling code. Any ideas to increase the 
> accuracy?

Scratch that. It must be the way I'm converting the digits to a double that 
introduces the inaccuracy.

    // pDigits is a pointer into a zero-terminated buffer (with the digits 
"278").
    double v = 0.0;
    while (*pDigits) {
        v = v * 10 + (*pDigits - '0');
        pDigits++;
    }

v is now 277999999999999.999990. Then it's scaled using the code previously 
posted to get 2.7799999999999998. How would I round this up to the original 
2.78?