I'm writing a subfunction that uses a lot of expt functions, so it tends to crash my main program a lot with over/underflow errors.
I wanted to know if there is anyway to intercept this error and, instead of crashing, have my subprogram return some value (-1, NIL, whatever) whenever an error occurs so my main program can keep going.
Samantha Skyler wrote: > I wanted to know if there is anyway to intercept this error and, > instead of crashing, have my subprogram return some value (-1, NIL, > whatever) whenever an error occurs so my main program can keep going.
In addition, you might want to look at using numeric type other than floating point. Rationals or rolling your own scaled integral type will give you what you need without any possibility of overflow.
* Samantha Skyler | I'm writing a subfunction that uses a lot of expt functions, so it | tends to crash my main program a lot with over/underflow errors.
This is so common a request that IEEE 754 has support for not causing an overflow or underflow, but instead return 0 and the largest possible value (as opposed to an internal "infinity" value). This is not directly supported by the Common Lisp standard, but you should find some support for it in your implementation, or, if not, you should request it. -- In a fight against something, the fight has value, victory has none. In a fight for something, the fight is a loss, victory merely relief.
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