Specifying precision in %(...%) print format

[H. S. Teoh]

I have an array of reals that I want to format with writefln, but the
precision field needs to be passed in a variable. For a single real, it
would be writefln("%.*f", precision, x); but when I try this:

	int precision = ...;
	real[] array = ...;
	writefln("%(%.*f, %)", precision, array);

I get a runtime exception with the message "integral". I assume that's
because %(%) is expecting an array, but sees an int, so it fails. But
swapping the order of parameters doesn't help either:

	writefln("%(%.*f, %)", array, precision);

produces "floating point format failure".

What's the right way to do this?


T

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