Rounding float values

KASR1

Is there any function to do the following operation in CPP? Round(3.4) = 3 Round(3.5) = 4

Naveen

ceil() function? ceil( 3.4 + 0.5 ) = 3; ceil( 3.5 + 0.5 ) = 4;

KASR1

see ceil(3.4) will return 4. please check.

Malli_S

did u try any of

double floor(double x);
float floor(float x); // C++ only
long double floor(long double x); // C++ only
float floorf(float x);

-Malli...! :rose:****

Steve Echols

Try: floor(x + 0.5)

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Cedric Moonen

You have to use floor() and add 0.5 to the number you want to round.

Cédric Moonen Software developer
Charting control [v1.5] OpenGL game tutorial in C++

Naveen

:doh: ..am sorry.. I was ment to say floor() function. Please you floor().

KASR1

Yes its working now. Thanks.

KASR1

Working now.

Dan 0

Fastest way, assembler automatically will do rounding for you, but std lib does it some bakwards way

inline int iround(double v)
{
int retval;
__asm fld qword ptr [v]
__asm fistp dword ptr [retval]
return retval;
}