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Full Discussion: Division of int by double
Top Forums Programming Division of int by double Post 302911629 by Corona688 on Friday 1st of August 2014 06:22:17 PM
Old 08-01-2014
If you print it to the maximum precision a double really gives you, you will see that it's not really 1500 -- it's 1499.999999999999773. The .999999999999773 is truncated down to 0 since floating point numbers "round down" when you convert to int.

Just add 0.5 to the number before converting to integer to make it round the way you expect.

Code:
int           ires    = (t / adj)+0.5f;

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round(3M)						  Mathematical Library Functions						 round(3M)

NAME
round, roundf, roundl - round to nearest integer value in floating-point format SYNOPSIS
c99 [ flag... ] file... -lm [ library... ] #include <math.h> double round(double x); float roundf(float x); long double roundl(long double x); DESCRIPTION
These functions round their argument to the nearest integer value in floating-point format, rounding halfway cases away from 0, regardless of the current rounding direction. RETURN VALUES
Upon successful completion, these functions return the rounded integer value. If x is NaN, a NaN is returned. If x is +-0 or +- Inf, x is returned. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
feclearexcept(3M), fetestexcept(3M), math.h(3HEAD), attributes(5), standards(5) SunOS 5.11 12 Jul 2006 round(3M)
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