prog;

a () : int;
begin
  return 5;
end;
end a

b () : real;
begin
  return 5.5;
end;
end b

c () : bool;
begin
  var a : bool
  return a;
end;
end c

d () : string;
begin
  return "hello world";
end;
end d

begin
  write a ();
  write b ();
  write c ();
  write d ();
end;
end prog