The RND function allows the generation of random numbers by a program.
expression should evaluate to a numeric integer value or a runtime error will occur. The absolute value of expression is used by the function (see ABS). The highest number expression can be on Windows is PWR(2,15) - 1. The highest number on unix is PWR(2,31) - 1.
The function will return a random integer number between 0 and the value of expression-1.
prints 20 random numbers in the inclusive range 0 to 99.