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C++ 函数 - 按引用传递


按引用传递

在上一页的例子中,我们在传递参数给函数时使用了普通变量。你也可以将对函数的 引用 传递给函数。当需要更改参数的值时,这很有用。

例子

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

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

  cout << "交换之前: " << "\n";
  cout << firstNum << secondNum << "\n";

  // 调用函数,这将改变 firstNum 和 secondNum 的值
  swapNums(firstNum, secondNum);

  cout << "交换之后: " << "\n";
  cout << firstNum << secondNum << "\n";

  return 0;
}
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