DelphiBasics
 HighFunction Returns the highest value of a type or variable System unit
 function High(type or variable):Ordinal type;
Description
The High function returns the highest allowed value of either a type or variable of that type.

It only applies to characters, arrays, enumerations and short strings.

For arrays, it returns the higest index.
Notes
For multi-dimensional arrays, it returns the highest index of the first subarray (the left most definition of array range).

The size of an open array is given independent of the starting index of the array. It is the length of the array - 1.
Related commands
 Low Returns the lowest value of a type or variable
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 Example code : High applied to character, array, enumeration and short strings type   // Declare character, array and enumerated data types   TChar  = char;   TArray = array [3..7] of Integer;   TEnum  = (Mon=5, Tue, Wed, Thu, Fri, Sat, Sun);   TShort = shortstring; var   // Declare variables of the above data types   myChar  : TChar;   myArray : TArray;   myEnum  : TEnum;   myShort : TShort; begin   // Show the high values of the types and variables   ShowMessage('High(TChar)   = '+IntToStr(Ord(High(TChar))));   ShowMessage('High(myChar)  = '+IntToStr(Ord(High(myChar))));   ShowMessage('High(TArray)  = '+IntToStr(High(TArray)));   ShowMessage('High(myArray) = '+IntToStr(High(myArray)));   ShowMessage('High(TEnum)   = '+IntToStr(Ord(High(TEnum))));   ShowMessage('High(myEnum)  = '+IntToStr(Ord(High(myEnum))));   ShowMessage('High(TShort)  = '+IntToStr(Ord(High(TShort))));   ShowMessage('High(myShort) = '+IntToStr(Ord(High(myShort)))); end; Show full unit code High(TChar) = 255   High(myChar) = 255   High(TArray) = 7   High(myArray) = 7   High(TEnum) = 11   High(myEnum) = 11   High(TShort) = 255   High(myShort) = 255
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