fdim, fdimf, fdiml - positive difference
These functions return the positive difference, max(
y,0), between their arguments.
On success, these functions return the positive difference.
y is a NaN, a NaN is returned.
If the result overflows, a range error occurs, and the functions return HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively.
See math_error(7) for information on how to determine whether an error has occurred when calling these functions.
The following errors can occur:
errno is set to ERANGE. An overflow floating-point exception (FE_OVERFLOW) is raised.
These functions first appeared in glibc in version 2.1.
C99, POSIX.1-2001, POSIX.1-2008.
Before glibc version 2.24 on certain architectures (e.g., x86, but not x86_64) these functions did not set
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