Delphi – E2001 Ordinal type required 

Posted by AbundantCode

At this point, the compiler demanded an ordinal type. The predefined types Integer, Char, WideChar, Boolean, and specified enumerated kinds are known as ordinal types.

Ordinal types are needed in a variety of situations:

An array’s index type must be ordinal.

The low and high bounds of a subrange type must be ordinal type constant expressions.

An ordinal type must be the element type of a set.

A case statement’s selection phrase must be of ordinal type.

A variable of either ordinal or pointer type must be the first parameter to the standard operations Inc and Dec.

program Produce;
type
  TByteSet = set of 0..7;
var
  BitCount: array [TByteSet] of Integer;
begin
end.

An array’s index type must be an ordinal type; type TByteSet is a set, not an ordinal type.

program Solve;
type
  TByteSet = set of 0..7;
var
  BitCount: array [Byte] of Integer;
begin
end.

As the array index type, specify an ordinal type.

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