Figure 7: Debugging the core of main3.

HP-UX:sample1> gdb main3 core
 ...
(gdb) bt
#0  0x2ed0 in calcEllipse () from main3
#1  0x2e48 in calcEllipse_wrap () from main3
#2  0x2c84 in mainloop () from main3
#3  0x2b48 in main () from main3
#4  0xc013e7b4 in ?? () from /usr/lib/libc.2
(gdb)