How to use gdb to find a floating point exception in g++ code

Question

I have a g++ program that runs without user input. Somewhere the program is interrupted and it says "Floating point exception." Can gdb help me find what's causing this in my code? How?

Answer 1

You can get help on GDB here and at Gnu's site here.

But the basics are this:

$ gdb ./your_program             // start gdb on the program
> run                            // run the program
> run argv1 argv2                // or run it with command line arguments
(floating point exception)       // let it run until exception occurs
> bt                             // bt will show the stack trace

Here are some gdb settings on how to make sure it stops on floating point exceptions.