istrdbl.cpp

C标准库源代码

/***
* istrdbl.cpp - definition for operator>>(double) member funct for istream class
*
*       Copyright (c) 1991-1997, Microsoft Corporation.  All rights reserved.
*
*Purpose:
*       Definition of operator>>(double) member function for istream class.
*       [AT&T C++]
*
*******************************************************************************/

#include <cruntime.h>
#include <internal.h>
#include <stdlib.h>
#include <iostream.h>
#pragma hdrstop

#pragma check_stack(on)         // large buffer(s)

#define MAXDBLSIZ       28

istream& istream::operator>>(double& n)
{
_WINSTATIC char ibuffer[MAXDBLSIZ];
    char ** endptr = (char**)NULL;
    if (ipfx(0))
        {
        if (getdouble(ibuffer, MAXDBLSIZ)>0)
            {
            n = strtod(ibuffer, endptr);
            }
        isfx();
        }
return *this;
}