#include <limits.h> #include <float.h> #include <sys/limits.h>
The header file limits.h specifies the sizes of integral types as required by the proposed ANSI C standard. The header file float.h specifies the characteristics of floating types as required by the proposed ANSI C standard. The constants that refer to long doubles that should appear in float.h are not specified because long doubles are not implemented. The header file sys/limits.h is a list of magnitude limitations imposed by a specific implementation of the operating system. All values in the files are specified in decimal.