What are some examples of using namespaces in C++?

What are some examples of using namespaces in C++?

Namespaces in C++ help organize code and prevent name conflicts. For example, you can define a namespace like this:

namespace MyNamespace {
    void myFunction() {
        // function implementation
    }
}

You can then call the function using MyNamespace::myFunction();.

Can you give me another example?

Sure! Here's another example:

namespace Math {
    const double PI = 3.14159;
    double square(double x) {
        return x * x;
    }
}

You can access PI and square using Math::PI and Math::square(5);.

What happens if I don't use namespaces?

Without namespaces, you risk name collisions, especially in larger projects. For instance, if two functions have the same name, the compiler won't know which one to use, leading to errors.

How do I create nested namespaces?

You can create nested namespaces like this:

namespace Outer {
    namespace Inner {
        void innerFunction() {
            // implementation
        }
    }
}

You can call it using Outer::Inner::innerFunction();.