You can do it by having each of the functions return "this"...but honestly, that looks kind of odd unless you have a very good reason for that type of functionality. 
Zhuge, thanks you so much!!! My class still works properly. Now my code is 2x simpler more.
Are all 100 functions written in a line such a way? :) 
Thanks you for your funny question!!!
My Edit:
In short, all functions are certainly separated into many types. (GET()  SET()  OPERATE()  ADDITIONAL(),...)
GET()  Currently they are not affected by ("return this") but in future they will be replaced by alias or pointer. :)
SET()  Finished replacing (void > this)
OPERATE()  "void" is redundant, so all OPERATE() are changed immediately now.
ADDITIONAL()  No need to want 'void' to be kept.
> Stop using 'void'! It's so horrible!!!!!!!!!!!
But, only an exception : a few special functions will never be applied "this" returning value.
I can't list all functions (they are written on a page 1000 lines !!!!!). But I can show the structure of the class (Demonstration mode)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

//Short version of Math structure
class Math{ //Math Manager
Math([...]){[...]}~Math([...]){[...]}
///////////////////////////////////////////////////////////////////////////////////////////
struct Data{ //Data Manager
public :
~Data([...]){[...]}Data([...]){[...]}
///////////////////////////////////////////////////////////////////////////////////////////
struct subData{ //Child Sata Manager
subData([...]){[...]}~subData([...]){[...]}
subData *Get(double &value){value = data;return this;}
subData *Set(double value){data = value;return this;}
Data *root(int Pos = 1){return (Pos == 1) ? pData : pData>Go(nPos);}
Math *Mroot(){return pData>root();}
subData *Go(int nPos){return &pData>subData[nPos];}
//[...] Many more functions...
private :
Data *pData;double data;
//[...] Many more variables...
}subdata[100]; //Size example
///////////////////////////////////////////////////////////////////////////////////////////
Data *Get(double &value){value = data;return this;}
Data *Set(double value){data = value;return this;}
Math *root(){return pMath;}
Data *Go(int nPos){return &pMath>data[nPos];}
Data *Calculate(){[...] return this;}
//[...] Many more functions...
private :
Math *pMath;double data;
//[...] Many more variables...
}
///////////////////////////////////////////////////////////////////////////////////////////
data[100]; //Actually it's a pointer (no size)
Math *Calculate(int nCount){[...] return this;}
[...] Too many other functions.... ????!?!?!?!??!
private :
//Many variables
};

I only list some of the most popular and important functions which are using in my project. With simple calculation, I can write :
Here, very very awful code :
1 2 3 4 5 6 7 8 9 10 11

//Math * mObj
mObj = new Math([...]);
mObj>data[0].Set(12.53);
mObj>data[0].subdata[0].Set(6.22);
mObj>data[0].subdata[1].Set(76.35);
mObj>data[1].Set(24.22);
mObj>data[1].subdata[0].Set(11.13);
mObj>data[1].subdata[1].Set(35.25);
mObj>data[1].subdata[2].Set(17.25);
mObj>Calculate(2);
//Many more commands...?!?!??!?!?!!?!?!??!?!?!?!?!??!?!?!?!?!?!?!??!?!?!?!?!

No !!!!!!!!
And the solution (It's best !!!!!!!!!!!!!!!!!) :
1 2

mObj>data[0].Set(12.53)>subdata[0]>Set(6.22)>Go(1)>Set(76.35)>root(1)>
Set(24.22)>subdata[0].Set(11.13)>Go(1)>Set(35.25)>Go(2)>Set(17.25)>Mroot()>Calculate(2);

Oh, I'm very happy!!!!!! what do you think? :)