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The fenv.h header file is part of the standard C library, defines various functions and macros for manipulating the floating-point environment. It allows us to control aspects related to floating-point arithmetic, like exception handling and rounding modes.
C − fenv.h Types
Following are the types defined in the header fenv.h −
| Sr.No. | Types & Description |
|---|---|
| 1 |
fenv_t
This type represents the entire floating-point environment.
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| 2 |
fexcept_t
This type represents all floating-point status flags collectively.
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Library Functions
Following are the functions defined in the header fenv.h −
| Sr.No. | Function & Description |
|---|---|
| 1 |
int feclearexcept( int excepts ) This function clears the specified floating-point status flags.
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| 2 |
int fetestexcept( int excepts ) This function determines which of the specified floating-point status flags are set.
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| 3 |
int feraiseexcept(int excepts) This function raises the specified floating-point exceptions.
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| 4 |
int fegetexceptflag( fexcept_t* flagp, int excepts ) This function retrieves the full contents of the floating-point exception flags.
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| 5 |
int fesetexceptflag(const fexcept_t *flagp, int excepts) This function sets the contents of the floating-point exception flags.
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| 6 |
int fegetround() This function retrieves the rounding direction.
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| 7 |
int fesetround( int round ) This function sets the rounding direction.
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| 8 |
int fegetenv( fenv_t* envp ) This function attempts to store the status of the floating-point environment in the object pointed to by envp.
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| 9 |
int fesetenv( const fenv_t* envp ) This function attempts to establish the floating-point environment from the object pointed to by envp.
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| 10 |
int feholdexcept( fenv_t* envp ) This function saves the environment, clears all status flags and ignores all future errors.
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| 11 |
int feupdateenv( const fenv_t* envp ) This function restores the floating-point environment and raises the previously raise exceptions.
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