Check out example codes for "return 0; c++". It will help you in understanding the concepts better.
Code Example 1
return 0;// C++ The return value of the main function is considered the "Exit Status" of the application. On most operating systems returning 0 is a success status like saying "The program worked fine". In C++ it is optional to type " return 0; " at the end of the main function and the compiler includes it automatically
Code Example 2
// This example gives a reason why you should use using namespace std #include <iostream> using namespace std; cout << "Hello "<<endl; /* this one is shorter*/ // without the using namespace std you will need to use this std::cout <<"Hello"<<std::cout<<endl /* this one is longer and it requires shorter amount of time */
Learn ReactJs, React Native from akashmittal.com