float fdimf( float x, float y );
(1) (since C99)double fdim( double x, double y );
(2) (since C99)long double fdiml( long double x, long double y );
(3) (since C99)#define fdim( x, y )
(4) (since C99)1-3) Returns the positive difference between x and y, that is, if x>y, returns x-y, otherwise (if xâ¤y), returns +0.
4) Type-generic macro: If any argument has type long double, fdiml is called. Otherwise, if any argument has integer type or has type double, fdim is called. Otherwise, fdimf is called.
If successful, returns the positive difference between x and y.
If a range error due to overflow occurs, +HUGE_VAL, +HUGE_VALF, or +HUGE_VALL is returned.
If a range error due to underflow occurs, the correct value (after rounding) is returned.
[edit] Error handlingErrors are reported as specified in Template:rllpt.
If the implementation supports IEEE floating-point arithmetic (IEC 60559),
Equivalent to fmax(x-y, 0) except for the NaN handling requirements.
[edit] Example#include <errno.h>
#include <fenv.h>
#include <math.h>
#include <stdio.h>
// #pragma STDC FENV_ACCESS ON
int main(void)
{
printf("fdim(4, 1) = %f, fdim(1, 4)=%f\n", fdim(4,1), fdim(1,4));
printf("fdim(4,-1) = %f, fdim(1,-4)=%f\n", fdim(4,-1), fdim(1,-4));
//error handling
errno = 0; feclearexcept(FE_ALL_EXCEPT);
printf("fdim(1e308, -1e308) = %f\n", fdim(1e308, -1e308));
if (errno == ERANGE)
perror(" errno == ERANGE");
if (fetestexcept(FE_OVERFLOW))
puts(" FE_OVERFLOW raised");
}
Possible output:
fdim(4, 1) = 3.000000, fdim(1, 4)=0.000000
fdim(4,-1) = 5.000000, fdim(1,-4)=5.000000
fdim(1e308, -1e308) = inf
errno == ERANGE: Numerical result out of range
FE_OVERFLOW raised[edit] References
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