C++ 函数 - 按引用传递

通过引用传递

在上一页的示例中，我们在将参数传递给函数时使用了普通变量。您还可以通过参考到函数。当您需要更改参数的值时，这会很有用：

示例

void swapNums(int &x, int &y) {
int z = x;
x = y;
y = z;
}

int main() {
int firstNum = 10;
int secondNum = 20;

cout << "Before swap: " << "\n";
cout << firstNum << secondNum << "\n";

// Call the function, which will change the values of firstNum and secondNum
swapNums(firstNum, secondNum);

cout << "After swap: " << "\n";
cout << firstNum << secondNum << "\n";

return 0;
}

亲自试一试 »