> I am actually using Microsoft Visual C++ 6.0 compiler
A bit better than what I feared you were stuck with, but not much
Do you use projects, or do you just type
cl prog.c
in a command line box?
Projects
Locate projects->settings C/C++ (I think)
one of the options configures the warning level.
Command line
Start with
cl /?
to get a list of options. I think the warning level is
cl /W4 prog.c