int month = 9, day = 7;
int month = 09, day = 07;

are they the same?

Does putting a zero in front mean it is octal instead of decimal number?

also,

L'a' and L"a"

are those the same?

putting L in front of a character literal turns it into type wchar_t. does it apply to string literals too?

When I did this ;


I got this
1>c:\users\jordan\documents\visual studio 2010\projects\hold\hold\hold.cpp(10): error C2041: illegal digit '9' for base '8'

Does putting a zero in front mean it is octal instead of decimal number?

Yes, it does. Did you try to compile you code? Because it should give you an error on int month = 09:
error: invalid digit "9" in octal constant|