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C++ Interview questions on name mangling, extern, and struct

(Last Updated On: May 12, 2010)

C++ Interview questions on name mangling, extern, and struct

Name mangling:
What is name mangling in C++??
The process of encoding the parameter types with the function/method name into a unique name is called name mangling. The inverse process is called demangling.
For example Foo::bar(int, long) const is mangled as `bar__C3Fooil’.
For a constructor, the method name is left out. That is Foo::Foo(int, long) const is mangled as `__C3Fooil’.

What does extern “C” int func(int *, Foo) accomplish?
It will turn off “name mangling” for func so that one can link to code compiled by a C compiler.

Const:
What is the difference between const char *myPointer and char *const myPointer?
Const char *myPointer is a non constant pointer to constant data; while char *const myPointer is a constant pointer to non constant data.
Name two cases where you MUST use initialization list as opposed to assignment in constructors.
Both non-static const data members and reference data members cannot be assigned values; instead, you should use initialization list to initialize them.
Global variables:
Can you think of a situation where your program would crash without reaching the breakpoint which you set at the beginning of main()?
C++ allows for dynamic initialization of global variables before main() is invoked. It is possible that initialization of global will invoke some function. If this function crashes the crash will occur before main() is entered.

Struct:
What are the differences between a C++ struct and C++ class?
The default member and base class access specifiers are different.
The C++ struct has all the features of the class. The only differences are that a struct defaults to public member access and public base class inheritance, and a class defaults to the private access specifier and private base class inheritance.

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