065.Ada.Text.IO的单独实例化

最新推荐文章于 2025-07-23 09:48:54 发布

dos diosas

最新推荐文章于 2025-07-23 09:48:54 发布

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分类专栏： # Ada语言程序设计基础

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本文详细介绍了在Ada程序中如何实例化Ada.Text_IO库，以实现不同类型数据的输入输出。通过具体代码示例，展示了整数、浮点数、枚举类型、自定义整型和浮点型的输出格式。

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这里声明了 Ada.Text_IO的六个单独的实例化，以便与程序中使用的六种类型一起使用，为了输出我们在此程序中使用的各种类型，这些都是必需的。在声明各种类型后，必须声明包实例化。

with Ada.Text_IO;
use Ada.Text_IO;

procedure Formats is
   
   type MY_FIXED is delta 0.01 range 20.0..42.0;
   type DAY is (MON,TUE,WED,THU,FRI,SAT,SUN);
   type MY_INTEGER is range -13..323;
   
   X_Value:Float :=3.14;
   Index:Integer:=27;
   Count:MY_INTEGER:=-7;
   What:Boolean:=TRUE;
   Who:Boolean:=False;
   Size:MY_FIXED:=24.33;
   Today:DAY:=TUE;
   
   package Int_IO is new Ada.Text_IO.Integer_IO(Integer);
   use Int_IO;
   package Flt_IO is new Ada.Text_IO.Float_IO(Float);
   use Flt_IO;
   package Enum_IO is new Ada.Text_IO.Enumeration_IO(Boolean);
   use Enum_IO;
   
   package Fix_IO is new Ada.Text_IO.Fixed_IO(MY_FIXED);
   use Fix_IO;
   package Day_IO is new Ada.Text_IO.Enumeration_IO(DAY);
   use Day_IO;
   package New_Int_IO is new Ada.Text_IO.Integer_IO(MY_INTEGER);
   use New_Int_IO;
   
begin
   -- integer output
   Put("Index is --->");Put(Index);Put("<---");New_Line;
   Put("Index is --->"); Put(Index,3); Put("<---"); New_Line;
   Put("Index is --->"); Put(Index,8); Put("<---"); New_Line(2);
   Put("Count is --->"); Put(Count);   Put("<---"); New_Line;
   Put("Count is --->"); Put(Count,3); Put("<---"); New_Line;
   Put("Count is --->"); Put(Count,8); Put("<---"); New_Line(2);
   
   
   -- float output
   Put("Put(X_Value)------>");Put(X_Value); New_Line;
   Put("Put(X_Value,5)------>");Put(X_Value,5); New_Line;
   Put("Put(X_Value,5,5)------>");Put(X_Value,5,5); New_Line;
   Put("Put(X_Value,5,5,0)------>");Put(X_Value,5,5,0); New_Line(2);
     
     
                                            -- MY_FIXED outputs
   Put("Put(Size) -------->"); Put(Size);        New_Line;
   Put("Put(Size,5) ------>"); Put(Size,5);      New_Line;
   Put("Put(Size,5,5) ---->"); Put(Size,5,5);    New_Line;
   Put("Put(Size,5,5,0) -->"); Put(Size,5,5,0);  New_Line(2);

                                       -- BOOLEAN outputs
   Put("What is ---->"); Put(What);   Put("<---"); New_Line;
   Put("Who is ----->"); Put(Who);    Put("<---"); New_Line;
   Put("What is ---->"); Put(What,7); Put("<---"); New_Line;
   Put("Who is ----->"); Put(Who,8);  Put("<---"); New_Line;
   Put("TRUE is ---->"); Put(TRUE);   Put("<---"); New_Line;
   Put("FALSE is --->"); Put(FALSE);  Put("<---"); New_Line(2);

                                       -- Enumeration outputs
   Put("Today is --->"); Put(Today);   Put("<---"); New_Line;
   Put("Today is --->"); Put(Today,6); Put("<---"); New_Line;
   Put("Today is --->"); Put(Today,7); Put("<---"); New_Line;
   Put("WED is ----->"); Put(WED);     Put("<---"); New_Line;
   Put("WED is ----->"); Put(WED,5);   Put("<---"); New_Line(2);
     
  end Formats;