int &j = i 就是给变量i声明了另一个名称j,二者标记的是同一个指针地址。一个变量被重新赋值，另一个变量也会随之变化。 //1. 值传递
void mySwap01(int a, int b) {
int temp = a;
a = b;
b = temp;
}
//2. 地址传递
void mySwap02(int* a, int* b) {
int temp = *a;
*a = *b;
*b = temp;
}
//3. 引用传递
void mySwap03(int& a, int& b) {
int temp = a;
a = b;
b = temp;
}
int main() {
int a = 10;
int b = 20;
mySwap01(a, b);
cout << "a:" << a << " b:" << b << endl;
mySwap02(&a, &b);
cout << "a:" << a << " b:" << b << endl;
mySwap03(a, b);
cout << "a:" << a << " b:" << b << endl;
system("pause");
return 0;
}
int func(int a = 10, int b = 10); // 声明
int func(int a, int b) // 实现
{
return a + b;
}