首页 > 试题广场 >

以下程序输出什么？ #include <io

[单选题]

以下程序输出什么？
#include <iostream>
class ComponentA
{
public:
  ComponentA()
  {
    std::cout << "a";
  }
  ~ComponentA()
  {
    std::cout << "~a";
  }
};

class ComponentB
{
public:
  ComponentB()
  {
    std::cout << "b";
    throw std::exception();
  }
  ~ComponentB()
  {
    std::cout << "~b";
  }
};

class ComponentC
{
public:
  ComponentC()
  {
    std::cout << "c";
  }
  ~ComponentC()
  {
    std::cout << "~c";
  }
};

class Container
{
  ComponentA m_a;
  ComponentB m_b;
  ComponentC m_c;
public:
  Container()
  {
    std::cout << "d";
  }
  ~Container()
  {
    std::cout << "~d";
  }
};

int main()
{
  try
  {
    Container c;
  }
  catch (std::exception const &)
  {
  }
  return 0;
}

```
ab~b~a
```
```
ab~a
```
```
abcd~d~c~b~a
```
```
其他都不对
```

查看正确选项

燦爛11

D？

发表于 2024-11-20 23:29:33 回复(0)

AD2017

注意到ComponentB的构造函数会抛出错误

class ComponentB
{
public:
  ComponentB()
  {
    std::cout << "b";

//抛出错误
    throw std::exception();
  }
  ~ComponentB()
  {
    std::cout << "~b";
  }
};

编辑于 2024-11-19 17:50:27 回复(0)