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Raeldor

Rounding in c++

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How can I round a float to the nearest x decimal places, rounding down if below '5' and up if = or above? Thanks

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I don't believe there's a library function to do it, but the standard solution is pretty easy to implement.

double round(double n, int places)
{
double p = pow(10, places);
return floor(n * p + 0.5)/p;
}

I believe pow and floor are both in math.h.

CM

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Quote:
Original post by Conner McCloud
I don't believe there's a library function to do it, but the standard solution is pretty easy to implement.

double round(double n, int places)
{
double p = pow(10, places);
return floor(n * p + 0.5)/p;
}

I believe pow and floor are both in math.h.

CM


Yes, both in <cmath> (new standard) and <math.h> (deprecated).

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