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When I compile this code
{$WARNINGS ON}
function Test(s: string): string;
var
t: string;
d: double;
begin
if s = '' then begin
t := 'abc';
d := 1;
end;
Result := t + FloatToStr(d);
end;
I get the warning "Variable 'd' might not have been initialized", but I do not get the same warning for variable 't'. This seems inconsistent. This code is only a simple example to show the compiler warnings, but I have just found a bug in my live code which would have been caught by a compile-time warning for uninitialised string variables. Can I switch this warning on somehow in Delphi 6? Or in a newer version of Delphi?
642
Initializing a variable means specifying an initial value to assign to it (i.e., before it is used at all). Notice that a variable that is not initialized does not have a defined value, hence it cannot be used until it is assigned such a value.
If you declare a variable as final, it is mandatory to initialize it before the end of the constructor. If you don't you will get a compilation error.
Local Variables If you cannot initialize your local variable where it is declared, make sure to assign it a value before you attempt to use it. Accessing an uninitialized local variable will result in a compile-time error.
Nope, there is no switch for this. The warning doesn't occur because a string is a compiler managed type and is always initialized by the compiler.
83
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