Question

1. Why would you use "using namespace" inside of your function instead of the above main?- Give examples

Answer 1

/*If you have any query do comment in the comment section else like the solution*/

If you'll declare the using namespace above main, then while using any standard object you do not have to write std::, but if you will declare inside a function then the inbuild objects can be used only inside that function without writing std::

Ex: Using namespace above main, then there is no need to use std:: inside any function to use cout.

#include <iostream>

using namespace std;

void fun() {
    cout<<"Inside fun";
}
int main()
{
    cout<<"Hello World";
    fun();
}

Using name space inside a function, it has been declared inside fun() method so to use cout there is no need to prepend it with std::, but since it is local to function fun(), you have to use std::before cout to make it work properly

#include <iostream>

void fun() {
    using namespace std;
    cout<<"Inside fun";
}
int main()
{
    std::cout<<"Hello World";
    fun();
}