C语言库函数的原型,有用的拿去

				/***
				*llabs.c - find absolute value of a long long integer
				*
				*       Copyright (c) Microsoft Corporation. All rights reserved.
				*
				*Purpose:
				*       defines llabs() - find absolute value of a long long integer.
				*
				*******************************************************************************/
				
				#include 
				#include 
				
				#if _MSC_FULL_VER >= 160020117LL
				#pragma function(llabs)
				#endif  /* _MSC_FULL_VER >= 160020117LL */
				
				/***
				*long long llabs(lnumber) - find absolute value of long long.
				*
				*Purpose:
				*       Find the absolute value of a long long integer (lnumber if lnumber >= 0),
				*       -lnumber if lnumber < 0).
				*
				*Entry:
				*       long long lnumber - number to find absolute value of
				*
				*Exit:
				*       returns the absolute value of lnumber
				*
				*Exceptions:
				*
				*******************************************************************************/
				
				long long __cdecl llabs (
				        long long lnumber
				        )
				{
				        return( lnumber>=0LL ? lnumber : -lnumber );
				}