A buddy offers you the random number generator shown below: My-Random()\sout: r is a random integer. constant: modulus m; initial value X0 local: previously produced random number x (x = X0 at first) If x mod 2 = 0, then 2: r (x + 3). 3: Otherwise, if x mod 3 = 0, then 4: r (x + 5). 314159265 Exclusive-or in bits. 5: Otherwise, if x mod 5 = 0, then 6: r x2 7: else 8: r ← x + 7 9: end if 10: r r mod m; x r 11: r return How can you tell how well (or how badly) it works?
A buddy offers you the random number generator shown below: My-Random()\sout: r is a random integer. constant: modulus m; initial value X0 local: previously produced random number x (x = X0 at first) If x mod 2 = 0, then 2: r (x + 3). 3: Otherwise, if x mod 3 = 0, then 4: r (x + 5). 314159265 Exclusive-or in bits. 5: Otherwise, if x mod 5 = 0, then 6: r x2 7: else 8: r ← x + 7 9: end if 10: r r mod m; x r 11: r return How can you tell how well (or how badly) it works?
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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A buddy offers you the random number generator shown below:
My-Random()\sout: r is a random integer.
constant: modulus m; initial value X0 local: previously produced random number x (x = X0 at first)
If x mod 2 = 0, then 2: r (x + 3).
3: Otherwise, if x mod 3 = 0, then 4: r (x + 5). 314159265 Exclusive-or in bits.
5: Otherwise, if x mod 5 = 0, then 6: r x2
7: else
8: r ← x + 7
9: end if 10: r r mod m; x r 11: r return
How can you tell how well (or how badly) it works?
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