The main reason is lengthy C programs lose "Global View" and

become very difficult to visualize as a single concept.

C++ is an advance than C lang which has more features...

But comparing efficiency C is more efficient than C++

But C++ has more flexibility than C.

Also C++ is both combination of OOP and OBP concepts.

C++ has more features as

1.Object oriented

2.Information hiding

3.Standard Template Library

4.Inheritance

5.Constructors & Destructors

6.Exception Handling

7.Overloading