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What is an interface in C++?

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C++ interface is defined as a way to describe the behavior of a class without taking the implementation of that class or in layman terms; we say that the C++ interface is a pure virtual function. An interface or abstract class is the same.
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Experienced Computer trainer having worked in IT sector for 20 years.

C++ interface is defined as a way to describe the behavior of a class without taking the implementation of that class or in layman terms; we say that the C++ interface is a pure virtual function. An interface or abstract class is the same.
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I am interested to enter IT field. But I am not from IT background. My qualification is BBM. I am planing to start with C and C++ course, but i don't have much idea about it. Can some one please let me know what is best course to start with.
if u really have interset in IT filed u better learn .net, core java, spring java, python programming languages than c and c++. but u don't know the basics programming language better going for c and c++ learning course.
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What is the main difference between returning value of a function and does not return any value of a function in  C. Which is correct void main(void), int main(void), int main(int) , or void main(int) and explain the main difference between int main() and int main(void). 

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