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1. Namespaces: Namespaces are a feature in C++ that allow us to group related functions, classes, and variables under a single name. This helps in preventing naming conflicts and organizing code. We can create a namespace using the keyword "namespace" followed by the namespace name and enclosing the contents within curly braces. We can access the contents of a namespace using the scope resolution operator "::". For example: namespace myNamespace {    int myFunction() {       // function code    } } int main() {    myNamespace::myFunction(); // accessing function from the namespace    return 0; } 2. Exception handling: Exception handling is a mechanism in C++ that allows us to handle errors and unexpected events that occur during program execution. We can use the keywords "try", "catch" and "throw" to implement exception handling. We enclose the code that can generate an exception within the try block. If an exception is thrown, the ...

 Exception handling is a mechanism that is used to handle the runtime errors that can occur in a program. It allows the programmer to deal with the errors and provide a meaningful response to the user. The following are some reasons why we need exception handling: Robustness: Exception handling makes programs more robust and less likely to crash due to errors. Debugging: Exception handling makes it easier to debug a program by providing a way to trace the error back to the source. Code separation: By separating the error handling code from the main code, we can make our code more organized and easier to read. Example: Consider the following program that reads two integers from the user and divides them: #include <iostream> using namespace std; int main() {     int x, y;     cout << "Enter two integers: ";     cin >> x >> y;     cout << x << "/" << y << "=" << x / y << endl;   ...