31 lines
932 B
C++
31 lines
932 B
C++
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// 引用的使用
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// 引用的本质是指针常量，所以引用的空间大小和指针相同，都是 8 个字节
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// 引用的本质是指针常量，所以引用的指向不能改变，但是指向的值可以改变
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// 引用的本质是指针常量，所以引用在定义时必须初始化，且不能再引用其他变量
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// int a = 10;
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// int &aa = a; // int * const aa = &a;
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#include <iostream>
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using namespace std;
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int main()
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{
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// 定义引用时，必须给初始化值，另外，定义之后引用不能再引用其他变量
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int a = 10;
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int &b = a; // 对 a 的引用
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b += 20; // 相当于 a += 20
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cout << "a: " << a << " b: " << b << endl;
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int &c = a;
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cout << "a: " << a << " b: " << b << " c: " << c << endl;
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int &d = b;
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cout << "a: " << a << " b: " << b << " c: " << c << " d: " << d << endl;
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int x = 100;
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c = x;
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cout << "c: " << c << endl;
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return 0;
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}
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