jap7g@psy3b2.psyc.Virginia.EDU (Jim A. Pisano) (04/06/88)
I'm writing a simple program that times keypresses using MicroSoft C V 5.0. The times are obtained using the 'ftime()' functions. I then convert the times (in integer form) to floating point #'s (doubles) & display the times of keypresses & elapsed time between presses. After the program runs (it runs correctly), I get the error: run-time error M6101: MATH - floating-point error: invalid The manual says that I tried to calculate infinity (I already know what infinity is) or I operated on a NAN (Not A Number). Here's my question: How can I find out where that NAN is? I have CodeView, but I haven't figured out how to trap this math error short of checking every variable everywhere. Is there a way to set a tracepoint when the math emulator is used? Thanks, Jim Pisano Psychology Department University of Virginia jap7g@virginia
greg@csanta.UUCP (Greg Comeau) (04/09/88)
In article <734@virginia.acc.virginia.edu> jap7g@psy3b2.psyc.Virginia.EDU (Jim A. Pisano) writes: >I get the error: >run-time error M6101: MATH >- floating-point error: invalid > >Here's my question: How can I find out where that NAN is? I have CodeView, >but I haven't figured out how to trap this math error short of checking >every variable everywhere. Is there a way to set a tracepoint when the You might be able to find out by using the signal() function so that it traps SIGFPE and jumps to one of your routines.