Повторять действие бесконечность раз

#include <iostream> 
int main()
{
    double a=0, b=0, c=0, d=0;
    std::cout << " Enter the width of the picture ";
    std::cin >> a;
    std::cout << " Enter the length of the picture ";
    std::cin >> b;
    c =a*b*0.00406;
    c = (int)( c * 100 + 0.5) / 100.;
    std::cout << "  The price is " << c << " Euro" << std::endl; 
    std::cout << "  Do you want to exit, or you want to continue? ";
    std::cout << "                                  1) I want to continue 2) I want to exit ";
    std::cin >> d;
    if (d == 1)
{
    double a=0, b=0, c=0, d=0;
    std::cout << " Enter the width of the picture ";
    std::cin >> a;
    std::cout << " Enter the length of the picture ";
    std::cin >> b;
    c =a*b*0.00406;
    c = (int)( c * 100 + 0.5) / 100.;
    std::cout << "  The price is " << c << " Euro" << std::endl;
}
    std::cout << " Press Enter...";
    std::cin.get();
    std::cin.get();
    return 0;
}

#include <iostream> 
int main()
{
    double a=0, b=0, c=0, d=0;
    do
    {
        std::cout << " Enter the width of the picture ";
        std::cin >> a;
        std::cout << " Enter the length of the picture ";
        std::cin >> b;
        c =a*b*0.00406;
        c = (int)( c * 100 + 0.5) / 100.;
        std::cout << "  The price is " << c << " Euro" << std::endl; 
        std::cout << "  Do you want to exit, or you want to continue? ";
        std::cout << "                                  1) I want to continue 2) I want to exit ";
        std::cin >> d;
    }while (d!=2);
    std::cout << " Press Enter...";
    std::cin.get();
    std::cin.get();
    return 0;
}

while(stupid_question)
    {
        std::cout << "RTFM !!!!!!!!!!!!!!!!!!" << std::endl;
        std::cout << "I mean read this: "
                     "Stephen Prata - C++ Primer Plus (6 Edition)."
        std::cout << std::endl;
    }