Cpp - &

C++ 的 &

    C++ 的 & 比起 C 語言的提取位置，還多了宣告引用 ( 必須在定義時候就進行初始化 )。

    int a = 5;
    int &b = a;
    std::cout << "a value\t\t" << a << "\n";
    std::cout << "a address\t" << &a << "\n";
    std::cout << "b value\t\t" << b << "\n";
    std::cout << "b address\t" << &b << "\n";
    int c = 50;
    b = c;
    std::cout << "a value\t\t" << a << "\n";
    std::cout << "a address\t" << &a << "\n";
    std::cout << "b value\t\t" << b << "\n";
    std::cout << "b address\t" << &b << "\n";
    std::cout << "c value\t\t" << c << "\n";
    std::cout << "c address\t" << &c << "\n";

a value         5
a address       0x61ff08
b value         5
b address       0x61ff08
a value         50
a address       0x61ff08
b value         50
b address       0x61ff08
c value         50
c address       0x61ff04

參考資料 :

https://www.itread01.com/content/1542680643.html