A perfect square root routine
Eugene E. McDonnell · ACM SIGAPL APL Quote Quad · 1986
To characterize a much larger effort, the design and implementation of a square root routine for IPSA APL is described. The routine is perfect in the sense that, if the result can be represented exactly, the exact result is given. If the result cannot be represented exactly, it is rounded to the nearest representable floating point number. The use of APL in designing and testing this routine is emphasized.