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Source code to Val procedure
Hi,
According to Delphi 7 help, the Val procedure is in the system unit. I can't find it there. I want to know if it always returns zero when Code is non zero.
My question is, where is the source code for Val?
Regards,
Bill
According to Delphi 7 help, the Val procedure is in the system unit. I can't find it there. I want to know if it always returns zero when Code is non zero.
My question is, where is the source code for Val?
Regards,
Bill
Asked:
3
2
1 Solution
Project / Options / Compiler / Debuggins
set there "Use Debug DCU" and when you execute your code Step Into the procedure ...
Your system unit is in folder C:\Program Files\Borland\Delphi5\lib,
Obviously the code you have in Source/RTL/Sys is not the unit compiled into this DCU. So use Step Into after you turn "Use Debug DCU". I think this should help ...
The Val source code isn't available because it's built into the compiler
The System.pas header comment say:
{ Predefined constants, types, procedures, }
{ and functions (such as True, Integer, or }
{ Writeln) do not have actual declarations.}
{ Instead they are built into the compiler }
{ and are treated as if they were declared }
{ at the beginning of the System unit. }
The System.pas header comment say:
{ Predefined constants, types, procedures, }
{ and functions (such as True, Integer, or }
{ Writeln) do not have actual declarations.}
{ Instead they are built into the compiler }
{ and are treated as if they were declared }
{ at the beginning of the System unit. }
BTW: -->I want to know if it always returns zero when Code is non zero.
Not exactly. It depends on the type of the returned var.
See:
Delphi syntax:
procedure Val(S: String; var V; var Code: Integer);
if S is '1.2' and V is integer, code will be 1 and V the integer part of S that is 1 in this case....
So not every time that Code is non zero return 0 for V also...
Hope is clear...
Not exactly. It depends on the type of the returned var.
See:
Delphi syntax:
procedure Val(S: String; var V; var Code: Integer);
if S is '1.2' and V is integer, code will be 1 and V the integer part of S that is 1 in this case....
So not every time that Code is non zero return 0 for V also...
Hope is clear...
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Well that is how C works, so, I guess that delphi will do the same.