Rounding......

What header file and function will let me round in C++, thanks a bunch!

None, here is keda's round function:
inline int round(const double d)
{ return (int)(d + 0.5); }

This rounds as well

Code:

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sprintf(tmp,"%5.2f",mydouble);
mydouble=ecvt(tmp);

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the .2 part sets the number of digits after the decimal - and it actually rounds up.

a more general rounding function

Code:

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#include <stdio.h>
double round(double p, int placesbefore,int placesafter){
        char tmp[20];
        sprintf(tmp,"%*.*f",placesbefore,placesafter,p);
        return ecvt(tmp);
}

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usage: mydouble = round(mydouble,5,2);