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round
Round double to nearest or even integer valued doubleSYNOPSIS:
double x, y, round();
y = round(x);
DESCRIPTION:
Returns the nearest integer to x as a double precision floating point result. If x ends in 0.5 exactly, the nearest even integer is chosen.
ACCURACY:
If x is greater than 1/(2*MACHEP), its closest machine representation is already an integer, so rounding does not change it.