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