Discussion
Which of the following is an illegal array definition?
Answer: B
Correct answer: var a:array[REAL]of REAL;
An array index type must be an ordinal type - one whose values can be counted off, so that each has a definite position. Enumerations, characters and booleans all qualify, which is why the other three definitions are legal. REAL is not ordinal: there is no “next” real number, so it cannot index an array.
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