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C++ Interview Questions and Answers

Ques 76. What is an explicit constructor?

Ans.
A conversion constructor declared with the explicit keyword. The compiler does not use an explicit constructor to implement an implied conversion of types. It?s purpose is reserved explicitly for construction.

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Ques 77. What is the Standard Template Library (STL)?
Ans. A library of container templates approved by the ANSI committee for inclusion in the standard C++ specification.
A programmer who then launches into a discussion of the generic programming model, iterators, allocators, algorithms, and such, has a higher than average understanding of the new technology that STL brings to C++ programming.
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Ques 78. Describe run-time type identification.
Ans.
The ability to determine at run time the type of an object by using the typeid operator or the dynamic_cast operator.
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Ques 79. What problem does the namespace feature solve?
Ans.
Multiple providers of libraries might use common global identifiers causing a name collision when an application tries to link with two or more such libraries. The namespace feature surrounds a library?s external declarations with a unique namespace that eliminates the potential for those collisions.
This solution assumes that two library vendors don?t use the same namespace identifier, of course.
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Ques 80. Are there any new intrinsic (built-in) data types?
Ans.
Yes. The ANSI committee added the bool intrinsic type and its true and false value keywords.
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3) Describe run-time type identification. 4) What problem does the namespace feature solve? 5) Are there any new intrinsic (built-in) data types? " />

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