rand  random real number procedure 
Syntax  rand (var r : real)

Description  The rand statement is used to create a pseudorandom number in the range zero to one. For example, if x is a real number, after rand(x), x would have a value such as 0.729548 or 0.352879.

Example  This program repeatedly and randomly prints out Hi ho, hi ho or It's off to work we go.
var r : real loop rand ( r ) if r > 0.5 then put "Hi ho, hi ho" else put "It's off to work we go" end if end loop 
Details  The rand statement sets its parameter to the next value of a sequence of pseudorandom real numbers that approximates a uniform distribution over the range 0<r <1. Each time a program runs, rand uses a different pseudorandom number sequence. To get the same sequence (use Rand.Set). To use several sequences of repeatable pseudorandom number sequences, use the randseed and randnext procedures. In many languages, rand would be a function rather than a procedure. It has been designed as a procedure in Turing to respect the mathematical idea that every call to a function using the same arguments (or no arguments at all) should return the same value. If rand were a function, this would not be true.

See also  randint, randomize, randseed and randnext. See also predefined unit Rand.
