Question

I have a string passed into a function, I would like to compare the first character of the string against a number.

I.E. 
if String(1) = "3"  then

When I compile I get:

warning: index for String may assume lower bound of 1
warning: suggested replacement String'First + 1

I would really like to make this right, but when I try “first” it actually grabs a number, not the character.

Is there a better way to do it?

I tried looking up the ‘First concept, and the below site explains I’m actually getting the number of the index, not the actual contents: http://en.wikibooks.org/wiki/Ada_Programming/Types/array

For example,

Hello_World  : constant String := "Hello World!";
World        : constant String := Hello_World (7 .. 11);
Empty_String : constant String := "";

Using ‘First I’ll get:

Array    'First 'Last 'Length 'Range
Hello_World   1       12       12     1 .. 12
World         7       11        5     7 .. 11
Empty_String  1        0        0     1 .. 0

Based on that information, I can’t get H from Hello world (for a comparison like if Hello_World(1) = “H” then)

EDIT:
So the way I initially was doing it was
(insert some variable name instead of string in this case)

String(String'First .. String'First) = "1"

So that works from what I can tell, however, rather then writing all that, I found out that

String(String'First) = '1'

Does the same thing but using char comparison, which makes a lot more sense!

Thanks for all the answers everyone!

Answer 1

The warning is suggesting you use:

String(String'First + Index)

Instead of just

String(Index)