Pascal的問題

Inc (procedure)
Increments a variable.

Declaration
procedure Inc(var X [ ; N: Longint ] );

Sample Code：
{Inc.PAS}
{Sample code for the Inc procedure.}

var
IntVar: Integer;
LongintVar: Longint;
begin
Inc(IntVar);{ IntVar := IntVar + 1 }
Inc(LongintVar, 5);{ LongintVar := LongintVar + 5 }
end.

你可以試用下..咪知點用！

Free Pascal supports pointer arithmetic as C does. This means that, if P is a typed pointer, the
instructions
Inc(P);
Dec(P);
Will increase, respectively decrease the address the pointer points to with the size of the type P is a
pointer to. For example
Var P : ^Longint;
...
Inc (p);
will increase P with 4. Normal arithmetic operators on pointers can also be used, that is, the following
are valid pointer arithmetic operations:
var p1,p2 : ^Longint;
L : Longint;
begin
P1 := @P2;
P2 := @L;
L := P1-P2;
P1 := P1-4;
P2 := P2+4;
end.
Here, the value that is added or substracted is multiplied by the size of the type the pointer points to.
In the previous example P1 will be decremented by 16 bytes, and P2 will be incremented by 16.