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The Computer Journal 1983 26(2):187; doi:10.1093/comjnl/26.2.187
© 1983 by British Computer Society
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Short Notes

A Note on Computing the Square Root of an Integer

C. J. Prosser1 * and A. C. Kilgour2 §

1 Rutherford and Appleton Laboratory, Chilton, Didcot, UK, 2 Department of Computing Science, University of Glasgow, Glasgow, UK

The method of successive subtraction for finding the square root of an integer or fixed-point number is particularly well-suited for implementation on a binary computer, and was in common use on first-generation machines. The method requires shifting but no division, and its execution time is dependent only on the precision required. A brief description of the method, a Pascal implementation, and some performance results are presented.

Received July 1982.

* Rutherford and Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK

§ Department of Computing Science, University of Glasgow, Glasgow G12 8QQ, UK


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