Exer02_34.cpp

// Warning: This is for verification. It cannot be compiled successfully by every compiler.
// The problem lies in line 29, 30, 31.
#include<iostream>
int main()
{
    int i = 0, &r = i;
    auto a = r;
    const int ci = i, &cr = ci;
    auto b = ci;
    auto c = cr;
    auto d = &i;
    auto e = &ci;
    const auto f = ci;
    auto &g = ci;
    const auto &j = 42;
    std::cout << a << " " <<
                 b << " " <<
                 c << " " <<
                 d << " " <<
                 e << " " <<
                 g << " " << std::endl;
    // Try to assign
    // legal
    a = 42;
    b = 42;
    c = 42;
    // illegal
    d = 42; // pointer, can't be assigned an int value
    e = 42; // const pointer, here const is low-level because of &
    g = 42; // const reference, const won't be ignored in this situation
    std::cout << a << " " <<
                 b << " " <<
                 c << " " <<
                 d << " " <<
                 e << " " <<
                 g << " " << std::endl;
    return 0;
}