List items can be either string or numeric variables. Reading past the end the last DATA statement generates an error. FNUM must be an integer value between 0 and 8. The variable ERL is set to the line number on which the file open error occured. Releases the file descriptor and flushes out all stored data.
Unreasonable addresses can cause bus errors.
Returns the sign of the parameter value. Returns 1 if the value is greater than zero , zero if equal to zero. Returns the integer value of x. Truncates toward zero. If EXPR is negative then EXPR seeds the random number generator.