1) The 1st thing to know about C++ is that it isn't easy language to learn. You can't learn C++ very fast. It takes time to learn C++. Dr.Bjarne Stroustrup (The creator of C++) also says that C++ is a complicated programming language.
2) One of the major strength of C++ is that it supports various programming styles. It is a multiparadigm programming language that not only supports Object oriented programming paradigm but also supports many other paradigms. And this is also the reason behind success of C++.
3) Concept of reference variables & operator overloading borrowed from Algol 68 programming language.
4) // single line comment borrowed from BCPL programming language.
5) comma , is used in 2 contexts as a operator & as a seperator.
6) Friend function enhances encapsulation if they used properly. Friend functions are very useful in operator overloading.
7) C++ is a strongly typed language & fortunately many warnings in C are compiler errors in C++. You must explicitly cast the void* appropriate pointer. Also, there are differences between int f() & int f(void) in C but both are having same meaning in C++.
8) There are 6 storage class specifiers in C++: auto, register, static, extern, typedef, mutable
9) The concept of inline functions borrowed from Ada programming language.
10) C++ got OO features from Simula67 Programming language.
11) C++ & C invented at same place: AT&T bell laboratories.
12) There are 84 keywords in C++.
13) Unexpected object slicing can occur when derived class object is passed to a method which expects object of a base class.
14) Default arguments can't be given in both function prototype & function definition.
15) Function overloading doesn't work with inheritance.
16) Destructor can be pure virtual.
Source: https://www.quora.com/Which-are-some-interesting-facts-about-C++-that-only-a-few-people-know
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