Rounding functions: Difference between revisions

Revision as of 03:10, 11 December 2002

Revision as of 23:04, 16 January 2003

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#REDIRECT [[significant figure]]

To round a fractional number to the nearest integer (in C):

int round(double d) { return (int)(d + 0.5); }

The above, however, rounds negative numbers

unintuitively, e.g., -2.7 becomes -2 instead of -3.

At the expense of more computation, one can use:

int sround(double d) { return (int)(d + (d >= 0? 0.5 : -0.5)); }