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2.4 float.h

2.3 errno.h

The errno header is used as a general error handler.

Macros:

EDOM
ERANGE
Variables:
errno

2.3.1 EDOM

Declaration:

#define EDOM some_value
EDOM is an identifier macro declared with #define. Its value represents a domain error which is returned by some math functions when a domain error occurs.

2.3.2 ERANGE

Declaration:

#define ERANGE some_value
ERANGE is an identifier macro declared with #define. Its value represents a range error which is returned by some math functions when a range error occurs.

2.3.3 errno

Declaration:

int errno;
The errno variable has a value of zero at the beginning of the program. If an error occurs, then this variable is given the value of the error number.
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2.4 float.h