You can add a line of code to print a few variables, but it may be easier to add a breakpoint at the same place and use the "info locals" and "info args" commands of gdb to display local variables and arguments.
When do people use print statements vs. gdb? I use print statements out of inertia but wonder if I should gdb more.
In my experience, print statements should be the starting point because they offer a fast and easy solution and can help you first of all confirm that you're looking at the right part of the code.
One point when I switch from print to debugger is when I need to run the thing over and over again switching print statements on the way – at that point it makes sense to bring in a debugger tool, halt the execution and explore what's wrong.
When do people use print statements vs. gdb? I use print statements out of inertia but wonder if I should gdb more.