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The same holds true for other run-time checking options, such as overflow and stack checking. com/epascal 30 Enumerated Types Enumerated types constitute another user-defined ordinal type. Instead of indicating a range of an existing type, in an enumeration you list all of the possible values for the type. In other words, an enumeration is a list of values. Here are some examples: type Colors = (Red, Yellow, Green, Cyan, Blue, Violet); Suit = (Club, Diamond, Heart, Spade); Each value in the list has an associated ordinality, starting with zero.

By checking the parameters, in fact, the compiler can determine which of the versions of the routine you want to call. Consider this series of functions extracted from the Math unit of the VCL: function function function function function Min Min Min Min Min (A,B: (A,B: (A,B: (A,B: (A,B: Integer): Integer; overload; Int64): Int64; overload; Single): Single; overload; Double): Double; overload; Extended): Extended; overload; When you call Min (10, 20), the compiler easily determines that you're calling the first function of the group, so the return value will be an Integer.

If you need to work on an array, you can always test its bounds by using the standard Low and High functions, which return the lower and upper bounds. Using Low and High when operating on an array is highly recommended, especially in loops, since it makes the code independent of the range of the array. Later, you can change the declared range of the array indices, and the code that uses Low and High will still work. If you write a loop hard-coding the range of an array you’ll have to update the code of the loop when the array size changes.

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