1. Explain the ideas of try, catch in Exception C++?

2. Explain the primary purpose of the following function?

void mysteryFunction(Rectangle& rect, double val) {
    try {
        rect.setWidth(val);
        rect.setLength(val);
    } 
    catch (Rectangle::NegativeWidth) {
        cout << "Fixing width automatically..." << endl;
        rect.setWidth(0);
        // throw; 
    } 
    catch (...) {
        cout << "An unknown error occurred!" << endl;
    }
}

3. Integrate these functions into the project and run a demo