Table 3 Standard C Headers: Group III (power at your fingertips when you need it)

<errno.h>    Error Detection
<float.h>    System Parameters for
             Real Arithmetic
<locale.h>   Cultural Adaptation
<math.h>     Mathematical Functions
<setjmp.h>   Non-local Branching
<signal.h>   Interrupt Handling (sort of)
<stdarg.h>   Variable-length Argument
             Lists