-- Demonstrates exception handling in a loop
-- Loop continues after exception is handled
-- Begin-exception-end is similar to a java try-catch
with ada.text_io; use ada.text_io; 
with ada.integer_text_io; use ada.integer_text_io; 
 
procedure excep2  is 
    n: Natural;
    s: Natural := 0;
    c: Character;
begin
    while not end_of_file loop
        excep:
        begin   -- A begin-end block can be added anywhere
            get(n);
            put_line("n: " & n'img);
            s := s + n;
        exception
            when data_error => 
                put_line("Data error: You must enter a number!");
                -- A non-numeric character in input raised the exception.
                -- The character that caused the exception is still
                -- in the input, and so we read it:
                get(c);       
                put_line("c=<" & c & ">");       

            when constraint_error => -- Negative value in the input
                put_line("Constraint error: You must enter an non-negative value!");

        end excep;  -- End begin-end block
        put_line("Repeat the loop");

    end loop;
    put_line("Sum: " & s'img);

end excep2;

-- Input: 
--|1a2-ab3c4-55d6-77 8 9

-- Output: 
--|n:  1
--|Data error: You must enter a number!
--|c=<a>
--|n:  2
--|Data error: You must enter a number!
--|c=<a>
--|Data error: You must enter a number!
--|c=<b>
--|n:  3
--|Data error: You must enter a number!
--|c=<c>
--|n:  4
--|Constraint error: You must enter an non-negative value!
--|Data error: You must enter a number!
--|c=<d>
--|n:  6
--|Constraint error: You must enter an non-negative value!
--|n:  8
--|n:  9
--|Sum:  33