INTERVIEW QUESTIONS C++ C++ BASICS DETAILS

Question: what are the differences between c and c++? If possible give more points.
what are the disadvantages of C++?

Answer: The syntax of C++ is a lot like C, with various extensions and extra keywords needed to support classes, inheritance and other OO features.

The syntax of C++ is a lot like C, with various extensions and extra keywords needed to support classes, inheritance and other OO features. Source: CoolInterview.com

C follows procedural programming paradigm while c++ is OOP.
Source: CoolInterview.com

difference in c & c++:
when we write the function like
void f();

in c it indicates that the function takes variable no of parameters whereas in c++ in indicates that the function f takes no parameter it is as good as void f(void); Source: CoolInterview.com

The principal difference is between structures in C and classes in C++ : all data and methods inside the C structure by defaulte are public and in C++ class are private Source: CoolInterview.com

1)C++ is object oriented programming language.C is a structure oriented programming language.

2)Compare to c, C++ has more advanced concepts like inheritance,data abstraction.polymorphism.

3)No need to call data type formats.but C we have to do.

4)We have more key words in c++.


Source: CoolInterview.com

* C does not have any classes or objects. It is procedure and function driven. There is no concept of access through objects and structures are the only place where there is a access through a compacted variable. c++ is object oriented.


* C structures have a different behaviour compared to c++ structures. Structures in c do not accept functions as their parts.


* C input/output is based on library and the processes are carried out by including functions. C++ i/o is made through console commands cin and cout.


* C functions do not support overloading. Operator overloading is a process in which the same function has two or more different behaviours based on the data input by the user.


* C does not support new or delete commands. The memory operations to free or allocate memory in c are carried out by malloc() and free().


* Undeclared functions in c++ are not allowed. The function has to have a prototype defined before the main() before use in c++ although in c the functions can be declared at the point of use.


* After declaring structures and enumerators in c we cannot declare the variable for the structure right after the end of the structure as in c++.


* For an int main() in c++ we may not write a return statement but the return is mandatory in c if we are using int main().


* In C++ identifiers are not allowed to contain two or more consecutive underscores in any position. C identifiers cannot start with two or more consecutive underscores, but may contain them in other positions.


* C has a top down approach whereas c++ has a bottom up approach.


* In c a character constant is automatically elevated to an integer whereas in c++ this is not the case.


* In c declaring the global variable several times is allowed but this is not allowed in c++.

Source: CoolInterview.com

C follows algorithmic approach
c++ follows Data centric approach
Source: CoolInterview.com

there are very few disadvantages of cpp with respect to c.
one off them is polymorphism makes a program bit slower.where as in c there is no concept of polymorphism. Source: CoolInterview.com

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