What is a reference variable in C++?

Question

What would be a brief definition of a reference variable in C++?

Answer 1

Reference variables allow two variable names to address the same memory location:

int main()
{
    int var1;

    // var2 is a reference variable, holds same value as var1

    int &var2 = var1;
    var1 = 10;

    std::cout << "var1 = " << var1 << std::endl;
    std::cout << "var2 = " << var2 << std::endl;
}

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