Debugger question - gdb?

[Ann Smith]

One of my coworkers is having a problem debugging a C program using gdb.

For some reason it seems to skip the instruction following an IF
statement. At first he thought maybe it was a bug in the debugger since
we are still using SUSE 7.0, but he tried debugging the program on a PC
running SUSE 7.3 and gdb does the same thing there.  This is normal? Is
gdb the debugger most people use when developing code to run under
LINUX?