Question

delphi 中 gg=low(integer)..high(integer)什么意思

Answer 1

帮助里有(函数返回参数的下限值 ):

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

Answer 2

gg是整型（Integer)的最小值到最大值的集合