Assign the values for an array in Ada

Question

I'm approaching the Ada language. I wrote this simple program that loops over an array and increments every single value, but the compiler gives me an error of type:

hello.adb:8:07: left hand side of assignment must be a variable

The program in question is this:

with Ada.Text_IO;
procedure hello is
type myArrayDefinition is array (1 .. 10) of integer;
myArray : constant myArrayDefinition := (1 => 3, others => 2);
begin
   for A in 1 .. 10 loop
     myArray(A) := myArray(A) + 1;
   end loop;
end hello;

Could anyone help me to understand the problem?

The error message tells you exactly what's wrong. myArray isn't a variable, it's a constant. — user1818839
– user1818839, Commented Nov 24, 2016 at 17:41
Just in case you have experience with some other language: an array object in Ada is not a reference, it is a true object. As noted, yours is constant, and then is constant as a whole. That's true for other objects as well. — B98
– B98, Commented Nov 25, 2016 at 19:05

Jacob Sparre Andersen · Accepted Answer · 2016-11-27 15:41:00Z

2

You can't modify the value of a constant. There are no special problems related to modifying the values of arrays.

answered Nov 27, 2016 at 15:41

Jacob Sparre Andersen

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1 Comment

T.E.D. Over a year ago

IOW: The compiler could have said: "The target of an assignment must be a variable, not a constant."

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