Convering strings containing number

[Mike Parker]

On Wednesday, 15 June 2022 at 04:26:44 UTC, Salih Dincer wrote:
> Hi,
>
> I've been interested in conversion possibilities for a while.  
> I tried to convert a string containing numbers but with no 
> success in single digits.  The only solution I found is to 
> subtract 48 from the result:
>
> ```d
> import std;
> void main()
> {
>     string str = "abc123";
>     str[3..$].to!int.writeln; // 123
>     auto bar = str[3].to!int;
>     assert(bar == 49); // 49 is value for ASCII.
>     writeln(bar - 48); // 1
> }
> ```

By indexing `str`, you're getting a `char`. So `to` is operating 
on that rather than on a string. Slicing will give you what you 
want, since then you'd have a `"1"` rather than a `'1'`:

```d
str[3..4].to!int;
```