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Re: Unmathematical interface (contract) in Java?

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  Re: Unmathematical interface (contract) in Java? Martin Gregorie <martin@address-in-sig.invalid> - 2016-10-03 21:03 +0000

#35703 — Re: Unmathematical interface (contract) in Java?

On Mon, 03 Oct 2016 18:01:30 +0000, Stefan Ram wrote:

> Dr. E. F. Codd wrote about mathematics:
> 
>       "A special concern is that of avoiding the need for special
>       treatment of special cases except when absolutely necessary.".
> 
>   In Java, to print »s« indented by »n« spaces (assuming we are at the
>   start of a new line), one can write:
> 
> java.lang.System.out.printf ( "%" +( n > 0 ? n : "" )+ "s%s%n", "", s );
> 
>   . Yes, you can write "%2s" or "%1s", but "%0s" is not allowed! Now,
>   how unmathematical is this!
>
Preceding the width with a hyphen '-' left-justifies the value within the 
given field width, e.g.

   System.out.printf("%-6d", s);

though, of course, no justification is seen if the length of the value 
equals or exceeds the stated field width. Since K&R C and (presumably) 
all Java versions.


-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

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