Your question makes no sense, sorry.
Some C programs can be compiled in C++, yes.
no
all preprocessor directives start with #(hash) symbol in both c & c++
Yes. Microsoft Visual C++ is the correct name, but it is often abbreviated to MSVC++ or just VC++. They are all the same.
In C++ all false relational expressions have a mathematical value of 0.
All C++ keywords are reserved, as are all variable and function names that begin with two leading underscores.
J'ai cinquante-deux ans.
b+b+b+c+c+c+c =3b+4c
c + c + 2c + c + c = 6c
The C++ standard library contains all the pre-defined functions.
b + b + b + c + c + c + c = 3b + 4c
Every C plus plus program that is a main program must have the function 'main'.