Ada通用平均函数 [英] Ada Generic Averaging Function
问题描述
我有一个函数,可以对记录数组中的某个数值进行平均。此值是自然增量值或枚举类型增量。我已经正确地将它们的值进行了汇总,但是我的问题是:如何将数组的长度转换为泛型类型,以便它可以将整数和增量类型数都划分?
I have a function which averages a certain numeric value from an array of records. This value is either a natural or an enumerated type delta. I have it summing up the values correctly but my question is this: how do I get the length of an array into a generic type, so that it can divide both integers and delta type numbers?
推荐答案
这有一些缺陷,但这是否更接近您想要的?
This has some flaws in it, but is this closer to what you wanted ?
NWS。
with Ada.Text_Io;
procedure Main is
generic
type Element_T is private;
Zero : Element_T;
One : Element_T;
type Vec_T is array (Integer range <>) of Element_T;
with function "+"(Left, Right : in Element_T) return Element_T is <>;
with function "/"(Left, Right : in Element_T) return Element_T is <>;
package Arrayops is
function Sum (Vec : in Vec_T) return Element_T;
function Count (Vec : in Vec_T) return Element_T;
function Average (Vec : in Vec_T) return Element_T;
end Arrayops;
package body Arrayops is
function Sum (Vec : in Vec_T) return Element_T is
S : Element_T := Zero;
begin
for I in Vec'First .. Vec'Last loop
S := S + Vec(I);
end loop;
return S;
end Sum;
function Count (Vec : in Vec_T) return Element_T is
C : Element_T := Zero;
begin
for I in Vec'First .. Vec'Last loop
C := C + One;
end loop;
return C;
end Count;
function Average (Vec : in Vec_T) return Element_T is
S : constant Element_T := Sum (Vec);
Len : constant Element_T := Count (Vec);
begin
return S / Len;
end Average;
end Arrayops;
type Fl_Arr_T is array (Integer range <>) of Float;
package Fl_Arr is new Arrayops (Element_T => Float,
Zero => 0.0,
One => 1.0,
Vec_T => Fl_Arr_T);
type Int_Arr_T is array (Integer range <>) of Integer;
package Int_Arr is new Arrayops (Element_T => Integer,
Zero => 0,
One => 1,
Vec_T => Int_Arr_T);
My_Ints : constant Int_Arr_T (1 .. 5) := (6,7,5,1,2);
My_Floats : constant Fl_Arr_T (1 .. 7) := (6.1,7.2,5.3,1.4,2.5,8.7,9.7);
Int_Sum : constant Integer := Int_Arr.Sum (My_Ints);
Int_Count : constant Integer := Int_Arr.Count (My_Ints);
Int_Avg : constant Integer := Int_Arr.Average (My_Ints);
Float_Sum : constant Float := Fl_Arr.Sum (My_Floats);
Float_Count : constant Float := Fl_Arr.Count (My_Floats);
Float_Avg : constant Float := Fl_Arr.Average (My_Floats);
begin
Ada.Text_Io.Put_Line ("Integers => Sum: " & Integer'Image (Int_Sum) & ", Count: " & Integer'Image (Int_Count) & ", Avg: " & Integer'Image (Int_Avg));
Ada.Text_Io.Put_Line ("Floats => Sum: " & Float'Image (Float_Sum) & ", Count: " & Float'Image (Float_Count) & ", Avg: " & Float'Image (Float_Avg));
end Main;
结果:
整数=>总和:21,计数:5,平均:4
Integers => Sum: 21, Count: 5, Avg: 4
浮点数=>总和:4.09000E + 01,计数:7.00000E + 00,平均:5.84286E + 00
Floats => Sum: 4.09000E+01, Count: 7.00000E+00, Avg: 5.84286E+00
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