try  
{   
//尝试的代码块   

//当问题出现时抛出异常   
throw exception;  
}   
catch()  
{   
//处理错误的代码块   
}

//C++程序演示除以零时发生的情况
//并且未处理异常
#include
using namespace std;

//驱动程序
int main()
{
  int numerator = 5;
  int denominator = 0;

  int ans = numerator/denominator;

  //结果将不会显示
  cout << ans << endl;

  return 0;

}  

//C++程序处理
//除以零异常
#include
using namespace std;

//驱动程序
int main()
{
  int numerator = 5;
  int denominator = 0;
  int result;

  try
  {
    if(denominator == 0)
    {
      throw denominator;
    }
    result = numerator / denominator;
  }
  catch(int ex)
  {
    cout << "Exception: Divide by zero not allowed :" <<
             ex << endl;
  }
  cout << "Division Result is: " << result;

  return 0;
}  

例外：不允许除以零：0
Division Result is: 4197440

// C++ program to define a new exception
#include <iostream>
#include <exception>
using namespace std;
  
// Custom exception
class MyException: public exception
{
  public:
    virtual const char* what() const throw()
    {
        return "My Custom Exception";
    }
};
  
// Driver code
int main() 
{
  try 
  {
    throw MyException();
  }
  catch(MyException &e;) 
  {
    cout << e.what() << endl;
  }
  
  return 0;
}  

My Custom Exception

// C++程序定义一个新的异常
#include <iostream>
#include <exception>
using namespace std;
  
struct Exceptions : public exception 
{
   const char* Except() const throw () 
   {
      return "GeeksforGeeks";
   }
};
   
// 驱动程序
int main() 
{
  try 
  {
    throw Exceptions();
  } 
  catch(Exceptions& it) 
  {
    cout << "Customised Exception caught" << 
             endl;
    cout << it.Except() <<endl;
  } 
  catch(std::exception& it) 
  {}
}  

Customised Exception caught
GeeksforGeeks