Futurebasic/Language/Reference/on overflows

ON OVERFLOWS Statement (+) Appearance (+) Standard Console Syntax ON OVERFLOWS{FN userFunction|GOSUB{lineNumber|"stmtLabel"}} Description This statement designates a particular function or subroutine as an overflow handling routine. An overflow handling routine is called in response to any math operation involving a division by zero, or any floating-point math operation that results in a number larger than FB can handle. If you don't designate any overflow handling routine, FB will attempt to continue evaluating the expression, but the resulting number is unpredictable. See Also Appendix C: Data Types and Data Representation