ada.md

title	description	created	updated
Ada	Ada Programming language cheatsheet contains useful code syntax with examples which is handy while coding.	2020-06-24	2020-06-24

Sample program

with Ada.Text_IO; use Ada.Text_IO;
procedure Hello is
begin
		Put_Line ("Hello, World!");
end Hello;

• ada.text_io : package that contains routines for i/o of text
• with - tells compiler that the package will be used
• use : tells compiler that the package should be automatically searched and allows access to routines without using the fully qualified name
• procedure : used to declare a procedure named Hello here.
• Put_line : is a procedure for string output.
• -- : comment

Variables

varName : DataType := value

Constants

varName : Constant DataType := value

Conditional Statements

1. If-else

if conditional-expr then 
    --code if above statement is true
elseif conditional-expr then 
    --code if above statement is true
end if;

2. Case

case expr is 
    when expr => --code
    when expr => --code
    ...
    when others => --code;
end case;

Loops

1. Infinite loop:

This is the simplest loop

begin
   Index := 1; --initialization
    loop                            
     --code
	exit when Index = n;
	end loop;

2. while loop

   Count := 1;    --initialization
   while Count < n loop  
   --code
   end loop;

3. for loop

for Index in 1..n loop          
--code
end loop;

Sub programs

Functions and procedures are collectively called as sub-programs.

Syntax for procedure

procedure proc-name
(X : in Integer ; Y : out Integer ; Z : in out Integer ) is
begin
X := 10; −− it's an Error as you can’t modify an in parameter.
Y := X; −− can modify Y as it's an out parameter.
Z := Z + 1; −− can read and write as it's an in out parameter.
end proc-name;

Syntax for functions

function function_name(declaration) return value is
begin
--code
end function-name;