Getting 'N/D' to eval as a fraction not a decimal

[Joe Horn]

(03-10-2015 06:26 AM)cyrille de brébisson Wrote:  the subst solution is indeed the 'proper' one ...

... but not useable in a program, since it depends on the setting of a non-programmable mode (as explained above).

(03-10-2015 06:26 AM)cyrille de brébisson Wrote:  All the approaches using the CAS will be slower..

TEVAL(CAS(IP(N)/IP(D))) --> 0.001_s on an A/6975 Prime. TEVAL cannot yield any briefer non-zero duration.