The fegetenv() function in C/C++ is specified in header file cfenv.h and attempts to store the current state of the floating-point environment in the object pointed by envp. The floating point environment is a set of status flags and control modes which includes both floating point exception and the rounding direction mode.
int fegetenv( fenv_t* envp )
Parameter : The function accepts one mandatory parameter envp which specifies an object where the state of the floating-point environment is stored.
Return value: The function returns two values as below:
- On success, It returns zero.
- On failure, It returns nonzero.
Below programs illustrate the above function:
Program 1 :
Initial environment : Exception raised -> None Rounding mode is ->FE_TONEAREST Final environment : Exception raised -> FE_INVALID Rounding mode is ->FE_DOWNWARD
Program 2 :
Initial environment : Exception raised -> None Rounding mode is ->FE_TONEAREST Final environment : Exception raised -> FE_DIVBYZERO FE_INEXACT FE_INVALID FE_OVERFLOW FE_UNDERFLOW Rounding mode is ->FE_DOWNWARD
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