unit Unit4;interfaceuses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;implementation{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);
var
List1: array[0..3] of Double;
List2: array[5..17] of Double;
X: Word;
S, TempStr: string;
begin
for X := Low(List1) to High(List1) do
List1[X] := X * 3.4;
for X := Low(List2) to High(List2) do
List2[X] := X * 0.0123;
Str(Sum(List1):4:2, S);
S := 'Sum of List1: ' + S + #13#10;
S := S + 'Sum of List2: ';
Str(Sum(List2):4:2, TempStr); S := S + TempStr;
MessageDlg(s,mtcustom, [mbOk], 0);
end;function Sum( var X: array of Double): Double;var
I: Word;
S: Real;
begin
S := 0; { Note that open array index range is always zero-based. }
for I := 0 to High(X) do S := S + X[I];
Result := S;
end;
end.错误提示:[Error] Unit4.pas(37): Undeclared identifier: 'Sum'
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;implementation{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);
var
List1: array[0..3] of Double;
List2: array[5..17] of Double;
X: Word;
S, TempStr: string;
begin
for X := Low(List1) to High(List1) do
List1[X] := X * 3.4;
for X := Low(List2) to High(List2) do
List2[X] := X * 0.0123;
Str(Sum(List1):4:2, S);
S := 'Sum of List1: ' + S + #13#10;
S := S + 'Sum of List2: ';
Str(Sum(List2):4:2, TempStr); S := S + TempStr;
MessageDlg(s,mtcustom, [mbOk], 0);
end;function Sum( var X: array of Double): Double;var
I: Word;
S: Real;
begin
S := 0; { Note that open array index range is always zero-based. }
for I := 0 to High(X) do S := S + X[I];
Result := S;
end;
end.错误提示:[Error] Unit4.pas(37): Undeclared identifier: 'Sum'
var
I: Word;
S: Real;
begin
S := 0; { Note that open array index range is always zero-based. }
for I := 0 to High(X) do S := S + X[I];
Result := S;
end;procedure TForm1.Button1Click(Sender: TObject);
var
List1: array[0..3] of Double;
List2: array[5..17] of Double;
X: Word;
S, TempStr: string;
begin
for X := Low(List1) to High(List1) do
List1[X] := X * 3.4;
for X := Low(List2) to High(List2) do
List2[X] := X * 0.0123;
Str(Sum(List1):4:2, S);
S := 'Sum of List1: ' + S + #13#10;
S := S + 'Sum of List2: ';
Str(Sum(List2):4:2, TempStr); S := S + TempStr;
MessageDlg(s,mtcustom, [mbOk], 0);
end;
或者将function Sum( var X: array of Double): Double;改为
function TForm1.Sum( var X: array of Double): Double;
并在前面加上声明.