unifunc.c

计算器源代码c。和windows自带的功能差不多。很多科学计算还没有加入。

/****************************Module*Header***********************************\
* Module Name: UNIFUNC.C
*
* Module Descripton: Number to string conversion routines for Unicode
*
* Warnings:
*
* Created:  22-Aug-1995
*
* Author:   JonPa
\****************************************************************************/
#include <windows.h>
#include "scicalc.h"

#define CCH_DWORD   15  // enough for 9 chars in 2^32 + sign, zterm + slop

//
// NOTE!
//
//  Even though this function uses psz++ and psz--,
//      **IT IS STILL INTERNATIONAL SAFE!**
//
//  That is because we put the chars in the string, and
//  we are only ever using chars that are single byte in ALL
//  code pages ('0'..'9').
//
TCHAR *UToDecT( UINT value, TCHAR *sz) {
    TCHAR szTmp[CCH_DWORD];
    LPTSTR psz = szTmp;
    LPTSTR pszOut;

    do {
        *psz++ = TEXT('0') + (value % 10);

        value = value / 10;
    } while( value != 0 );

    for( psz--, pszOut = sz; psz >= szTmp; psz-- )
        *pszOut++ = *psz;

    *pszOut = TEXT('\0');

    return sz;
}

#ifdef UNICODE
#   if 0
double MyAtof( const WCHAR *string ) {
    char szAnsi[MAX_PATH];

    WideCharToMultiByte( CP_ACP, WC_COMPOSITECHECK, string, -1, szAnsi, sizeof(szAnsi), NULL, NULL );
    return atof( szAnsi );
}


WCHAR *MyGcvt( double value, int digits, WCHAR *buffer ) {
    char szAnsi[MAX_PATH];

    _gcvt( value, digits, szAnsi);

    MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, szAnsi, -1, buffer, MAX_PATH);
    return buffer;
}

#   endif
#endif