H. S. Bright
ABSTRACT
This report will describe and discuss a presently-operational software system for tracing and displaying numerical accuracy in digital computer calculation. A FORTRAN program processed by the system is executed in an artificial arithmetic, in which every arithmetic step produces, in addition to the numerical result, an estimate of the number of significant digits in that result. Programs have been processed successfully with significance mode segments totalling as many as 1400 FORTRAN statements.
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