C++ Interview Question and Answers
| 91. |
How can a struct in C++ differs from a struct in C? |
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The differences between struct in C++ and C are listed in the following points:
- In C and C++, the variables of the structures are public; however, in C, the variable cannot be declared as private or protected. On the contrary, in C++, the variables can be declared as private or protected.
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In C, the concept of inheritance is not supported. In C++, the concept of inheritance is fully supported.
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On declaring a struct in C, the addition of the struct keyword is must. On the contrary, there is no need of the struct keyword on declaring struct in C++.
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In C, the initialization cannot be done outside the scope of a structure. However, in C++, the initialization can be done outside the scope of a structure.
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In C, structures do not have direct functions or methods.
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| 92. |
How the keyword struct is different from the keyword class in C++? |
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In C++, a class is similar to a struct with the exception that, by default, all the members of a class are private; while the members of a struct are public. Encapsulation is not supported by structures but supported by classes. |
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| 93. |
Define pure virtual function? |
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Pure virtual function is defined as a virtual function in a base class. It is implemented in a derived class. A program may not declare an instance of a class that has a pure virtual function. |
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| 94. |
Define a conversion constructor? |
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A conversion constructor is a single argument constructor. It is used by the compiler to ocnvert a type of objects as an argument to a class type. |
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| 95. |
What is a default constructor? |
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A zero argument constructor or a constructor in which all the arguments have default values is called a default constructor. |
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Gk Questions with Answers