The feupdateenv() function in C++ first saves currently raised floating-point exceptions. It restores the floating-point environment from the given fenv_t object and then raises the exceptions which were saved previously.
int feupdateenv( fenv_t* envp )
Parameters: It accepts a single mandatory parameter envp which specifies the pointer to the fenv_t object that is set by an earlier call to feholdexcept or fegetenv or is equal to FE_DFL_ENV. The function also accepts a pointer of type fenv_t as its argument which holds a floating point environment previously set by using feholdexcept or fegetenv and restores that floating point environment along with the current environment.
Return Value: The function returns two kinds of value described below:
- It returns zero on success
- It returns non-zero value on failure
Below programs illustrate the above function.
log(0.0): -inf no exceptions raised
log(10.0): 2.302585 exceptions raised
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