I am not able to understand meaning if the command
can you please elaborate it.
Using namespace std;
@Saurabh10 A namespace is a declarative region that provides a scope to the identifiers (the names of types, functions, variables, etc) inside it. Namespaces are used to organize code into logical groups and to prevent name collisions that can occur especially when your code base includes multiple libraries.
Also refer this: https://www.tutorialspoint.com/What-does-using-namespace-std-mean-in-Cplusplus
Hope this helps 