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Showing content from https://en.cppreference.com/w/cpp/language/../numeric/../language/../numeric/fenv/fetestexcept.html below:

std::fetestexcept - cppreference.com

int fetestexcept( int excepts );

(since C++11)

Determines which of the specified subset of the floating point exceptions are currently set. The argument excepts is a bitwise OR of the floating point exception macros.

[edit] Parameters excepts - bitmask listing the exception flags to test [edit] Return value

Bitwise OR of the floating-point exception macros that are both included in excepts and correspond to floating-point exceptions currently set.

[edit] Example

Possible output:

1.0/0.0 = inf
division by zero reported
1.0/10 = 0.1
inexact result reported
sqrt(-1) = -nan
invalid result reported
[edit] See also

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