Algorithms to reveal properties of floating-point arithmetic

By Michael A. Malcolm

Communications of the ACM, Vol. 15 No. 11, Pages 949-951
10.1145/355606.361870

Two algorithms are presented in the form of Fortran subroutines. Each subroutine computes the radix and number of digits of the floating-point numbers and whether rounding or chopping is done by the machine on which it is run. The methods are shown to work on any “reasonable” floating-point computer.

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Algorithms to reveal properties of floating-point arithmetic

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