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190 | with ADC;
with DAC;
with Ada.Text_IO;
with Ada.Integer_Text_IO;
with Ada.Numerics.Elementary_Functions; use Ada.Numerics.Elementary_Functions;
procedure Control_Structures is
subtype Uppercase is Character range 'A' .. 'Z';
A, B, C : Integer;
D, E, F, G, H : Integer;
Ch : Character;
Temperature : Integer;
Valve_Setting : Integer;
Value : Integer;
Sum : Integer;
Success : Boolean;
Approx, X, Y : Float;
Tolerance : constant Float := 0.0001;
Letter : Uppercase := 'Q';
procedure Calculate_Valve (Current_Temp : in Integer;
New_Setting : out Integer) is
begin
New_Setting := 2 * Current_Temp;
end Calculate_Valve;
function Double (First : in Integer;
Second : in Integer) return Boolean is
(abs Second = 2 * abs First);
begin
A := 1;
B := 2;
C := 3;
D := 3;
E := 4;
Ch := 'D';
X := 123.4546;
if A < 0 then
A := -A;
D := 1;
end if;
if A in 1 .. 12 then
B := 17;
end if;
if A > B then
E := 1;
F := A;
else
E := 2;
F := B;
end if;
if A = B then
F := 3;
elsif A > B then
F := 4;
else
F := 5;
end if;
if A > B and A > C then
G := 6;
elsif B > A and B > C then
G := 7;
elsif C > A and C > B then
G := 8;
end if;
Success := True;
case Ch is
when 'a' .. 'z' =>
H := 1;
when 'A' .. 'Z' =>
H := 2;
when '0' .. '9' =>
H := 3;
when '.' | '!' | '?' =>
H := 4;
when others =>
H := 5;
Success := False;
end case;
-- If expressions
if A > B then
C := D + 5;
else
C := F / 2;
end if;
C := (if A > B then D + 5 else F / 2);
if A > B then
C := D + 5;
elsif A = B then
C := 2 * A;
else
C := F / 2;
end if;
C := (if A > B then D + 5 elsif A = B then 2 * A else F / 2);
if X >= 0.0 then
Y := Sqrt (X);
else
Y := Sqrt (-2.0 * X);
end if;
Y := Sqrt (if X >= 0.0 then X else -2.0 * X);
-- Check syntax for Boolean if expression examples
if (if C - D = 0 then E > 2 else True) then
null;
end if;
if (if C - D = 0 then E > 2) then
null;
end if;
if (if A < 0 then B < 0) then
null;
end if;
-- case expression example
Value := (case Letter is
when 'A' | 'E' | 'I' | 'L' | 'U' |
'N' | 'O' | 'R' | 'S' | 'T' => 1,
when 'D' | 'G' => 2,
when 'B' | 'C' | 'M' | 'P' => 3,
when 'F' | 'H' | 'V' | 'W' | 'Y' => 4,
when 'K' => 5,
when 'J' | 'X' => 8,
when 'Q' | 'Z' => 10);
-- loop examples
Sum := 0;
loop
Ada.Integer_Text_IO.Get (Value);
exit when Value < 0;
Sum := Sum + Value;
end loop;
Approx := X / 2.0;
while abs (X - Approx ** 2) > Tolerance loop
Approx := 0.5 * (Approx + X / Approx);
end loop;
for Count in Integer range 5 .. 8 loop
Ada.Integer_Text_IO.Put (Count);
end loop;
for Count in reverse Integer range 5 .. 8 loop
Ada.Integer_Text_IO.Put (Count);
end loop;
A := 9;
B := 2;
for Count in Integer range A .. B loop -- With a null range, this
Ada.Integer_Text_IO.Put (Count); -- loop iterates zero times
end loop;
for Count in reverse Integer range A .. B loop -- With a null range, this
Ada.Integer_Text_IO.Put (Count); -- loop iterates zero times
end loop;
loop
ADC.Read (Temperature); -- Read the temperature from the ADC
Calculate_Valve (Current_Temp => Temperature, -- Calculate the new
New_Setting => Valve_Setting); -- gas valve setting
DAC.Write (Valve_Setting); -- Change the gas valve setting
end loop;
end Control_Structures;
|