writef %d of string

Stewart Gordon smjg_1998 at yahoo.com
Thu Dec 1 07:45:54 PST 2011

On 12/10/2011 23:41, bearophile wrote:
> This code, that a sane language/language implementation refuses at compile-time, runs:

It's perfectly legal code, so the best a compiler can correctly do is give a warning. 
Some C(++) compilers understand printf and will warn if the format string doesn't match 
the arguments, but even this is rare AIUI.

To enforce well-formed format strings at compile time would require it to be made a 
language builtin.  Or maybe template metaprogramming can do it.

> import std.stdio;
> void main() {
>      writefln("%d", "hello");
> }
> And it outputs:
> ['h', 'e', 'l', 'l', 'o']
> Is this good/expected/acceptable/buggy?

It certainly should either throw an exception or generate more sane output such as Andrej 
is getting.  What DMD version are you using?


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