Best way to get the square root of a 16/32 bit unsigned integer

[sougata]

Hi All,

In one of my implementation of a true RMS voltmeter I used the Mchip technical bulletin TB040 to find the square root of a 16bit number. I was using the ADC in 8bit on a PIC18. I would like the pros to shed some light on a better way dealing with longs sqrt.

P.S. = Perhaps a better way to measure AC RMS