whats new ¦  programming tips ¦  indy articles ¦  intraweb articles ¦  informations ¦  links ¦  interviews ¦  misc ¦  forum
 kylix ¦  tutorials ¦  online shop ¦  photos ¦  Add&Win Game

Tips (1565)

Database (91)
Files (139)
Forms (113)
Graphic (116)
IDE (21)
Indy (5)
Internet / LAN (133)
IntraWeb (0)
Kylix (10)
Math (77)
Misc (128)
Multimedia (46)
Objects/
ActiveX (51)

OpenTools API (3)
Printing (35)
Strings (83)
System (268)
VCL (246)

Top15

Tips sort by
component


Search Tip

Add new Tip

Add&Win Game

Advertising

43 Visitors Online


SwissDelphiCenter is a Borland Technology Partner
 
...multiply big integer values?
Autor: Mileriam
Homepage: http://www.mediaceta.de
[ Print tip ]  

Tip Rating (2):  
     


type
  
IntNo = record
    
Low32, Hi32: DWORD;
  end;

function Multiply(p, q: DWORD): IntNo;
var
  
x: IntNo;
begin
  asm
    
MOV EAX,[p]
    MUL [q]
    MOV [x.Low32],EAX
    MOV [x.Hi32],EDX
  end;
  Result := x
end;


// Test the above with:
// So kannst du es testen

var
  
r: IntNo;
begin
   
r := Multiply(40000000, 80000000);
   ShowMessage(IntToStr(r.Hi32) + ', ' + IntToStr(r.low32))
end;

 

Rate this tip:

poor
very good


Copyright © by SwissDelphiCenter.ch
All trademarks are the sole property of their respective owners