delphi中找不到LOW和HIGH函数的定义

答案：应该是这个啊,帮助里有.
  
function Low(X);
  
In Delphi code, call Low to obtain the lowest value or first element of an Ordinal, Array or ShortString. Result type is X, or the index type of X where X is either a type identifier or a variable reference.
  
Type Low returns
  
Ordinal type (includes Int64) The lowest value in the range of the type
 Array type The lowest value within the range of the index type of the array
 short string type Returns 0
 Open array Returns 0
 short string parameter Returns 0
  
  
  
  function High(X);
  
Description
  
In Delphi code, call High to obtain the upper limit of an Ordinal, Array, or ShortString value. The result type is X, or the index type of X.
  
X is either a type identifier or a variable reference. The type denoted by X, or the type of the variable denoted by X, must be one of the following:
  
For this type High returns
  
Ordinal type (includes Int64) The highest value in the range of the type
 Array type The highest value within the range of the index type of the array. For empty arrays, High returns ?.
 short string type The declared size of the string
 Open array  The value, of type Integer, giving the number of elements in the actual parameter minus one
 short string parameter The value, of type Integer, giving the number of elements in the actual parameter minus one

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