Random

A random boolean with a given probability. If prob is zero, the output will always be false, if prob is one, the output will always be true, if prob is 0.5, the likelihood of false and true is equal.

This is both an expression and an action. The action draws a new random number, the expression reports the last drawn value.

Example:

 val gen = Random()
 val coin = gen.coin(0.4)
 Act(
   coin, // draw new number
   PrintLn("Random coin (slightly favouring false): " ++ coin.toStr)  // print current value
 )

A random number between a given lo and a given hi boundary. The boundaries are inclusive for integer numbers. For floating point numbers, the hi bound is exclusive.

This is both an expression and an action. The action draws a new random number, the expression reports the last drawn value.

Example:

 val gen = Random()
 val r1to10 = gen.range(1, 10)
 Act(
   r1to10, // draw new number
   PrintLn("Random number (1 to 10): " ++ r1to10.toStr)  // print current value
 )

A random number between zero (inclusive) and a given hi boundary (exclusive). hi may be negative, but it must not be zero.

This is both an expression and an action. The action draws a new random number, the expression reports the last drawn value.

Example:

 val gen = Random()
 val r100 = gen.until(100)
 Act(
   r100, // draw new number
   PrintLn("Random number: " ++ r100.toStr)  // print current value
 )