Re: random numbers in fortran


lane straatman wrote:

Since I want to simulate shuffling a deck of cards, I guess I'll ask
for 52 pseudorandoms at a pop, multiply by 52 and take the floor. I
believe this gives random ints between zero and fifty-one. Is a person
well advised to start his arrays at zero as with C?

On a machine that uses binary floatng-point, the result will
be between zero and 51 inclusive, assuming sensible
rounding (round toward positive infinity can produce 52).
On a machine that uses higher radix floating-point, such as
an IBM z-Series machine, the result can be in the range
[0, 52], even for sensible rounding. On such machines,
use truncating arithmetic, if possible, to avoid trouble.

Bob Corbett

.

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