// int &r = 1;
const int &r = 1;
cout << "r is " << r << endl;//output is 1
why const int &r = 1 is legal ? because const？ please help me. thanks in advance. this is from C++ Primer 5th Edition exercise 2.27 (c)
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Read more about [l-values & r-values](https://en.wikipedia.org/wiki/Value_%28computer_science%29#lrvalue). – Basile Starynkevitch Feb 05 '15 at 05:50
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Because you've taken the reference to the constant `int` value - namely `1`. If you could modify the value of `1` then `1 + 1` wouldn't be `2` (and in some languages you can modify the value of `1`, but C++ isn't one of them). – Elliott Frisch Feb 05 '15 at 05:51
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Wow - a duplicate that points to a duplicate. – Brett Hale Feb 05 '15 at 05:51