/*  sdmpsrnd.cpp  by K.Tsuru  */
// function ID = 343    DRADIX, BRADIX
/********************************************************************************
SDouble and SDecimal class
It provides the Boolean value whether it is possible to round off or not.
Counting from the last position of effective figures, if it conatins "n9or0" over
(radix-1)'s or zeros, it returns 'true' else 'false'.
0.1233 9999 9999 9999 ..... 9999 9875 4578 or
0.1234 0000 0000 0000 ..... 0000 0000 0001
is rounded off,it becomes 0.1234.
Perhaps it may set "n9or0" as two or three figures.
**********************************************************************************/
#ifndef SN_H
#include "sn.h"
#endif
bool SDouble::IsPossibleToRound(uint n9or0) const {
    uint ef = EffFig();
    if(!n9or0 || (n9or0 > ef) || (aHead < ef) ) return false;
    if(!Sign(343)) return true;
    fType rdx_1 = Radix() -1;
    uint j = 0;
    bool cr = false;

    if(figure(ef) == rdx_1){
        while( (figure(ef--) == rdx_1) && (j < n9or0) ) j++;
        if(j == n9or0) cr = true;
    } else if(figure(ef) == 0){
        while( (figure(ef--) == 0) && (j < n9or0) ) j++;
        if(j == n9or0) cr = true;
    }
    return cr;
}