trunc

Name

trunc, truncf, truncl
- round to integer, towards zero

Library

libm.lib

Synopsis

#include <math.h>

double trunc (double x);

float truncf (float x);

long double truncl (long double x);

Return values

x is integral, infinite or NaN , x itself is returned.

Detailed description

The trunc, truncf, and truncl functions return the nearest integral value with magnitude less than or equal to | x |. They are equivalent to rint, rintf, and rintl, respectively, in the FE_TOWARDZERO rounding mode.

Examples

#include <math.h>
int main( )
{
   double inp = 1048580.625;
   double y;
   y = trunc( inp );
   printf( "trunc( %f)  = %f\n", inp,  y );
   y = truncf( inp);
   printf( "truncf( %f) = %f\n", inp, y );
   y = truncl( inp);
   printf( "truncl( %f) = %f\n\n", inp, y );
}

Output

trunc ( 1048580.625 ) = 1048580.000000
truncf( 1048580.625 ) = 1048580.000000
truncl( 1048580.625 ) = 1048580.000000

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