Why I'm getting this "Range Violation" error?

[Mike Parker]

On Friday, 9 July 2021 at 07:21:06 UTC, rempas wrote:

>
> When I execute it, I'm getting a range violation error. If I 
> try to set "len" to be the length of the "prompt" minus 1, then 
> it will work and it will print the "prompt" until the 
> questionmark. So I cannot find where the error is...

Because you're indexing the prompt with i before you ensure that 
i is valid. Swap the operands in your if condition:

```
while (i < len && prompt[i] != '{')
```

Or better yet, use foreach, which exists to avoid this sort of 
mistake:

```
foreach(c; prompt) {
    if(c != '{') printf("%c", c);
}
```