Nodejs
FE
Cpp
daily Life
Nodejs
FE
Cpp
daily Life

Cpp 异常处理

NOTE

First Step

  • 核心的异常处理的关键字是：try catch throw

    • try 块中的代码标识将被激活的特定异常

    • catch 在您想要处理问题的地方，通过异常处理程序捕获异常

    • throw 当问题出现时，程序会抛出一个异常

try
{
   // 保护代码
}catch( ExceptionName e1 )
{
   // catch 块
}catch( ExceptionName e2 )
{
   // catch 块
}catch( ExceptionName eN )
{
   // catch 块
}
#include<iostream>
double division(int a, int b) {
    if (b == 0) {
        throw "Division by zero condition!"
    }
    return (a / b);
}
int main() {
    int x = 50;
    int y = 60;
    double z = 0;

    try {
        z = division(a, b);
        std::cout << z << std::endl;
    } catch (const char* msg) {
        std::cerr << msg << std::endl;
    }
    return 0;
}

Normal Exception

  • header file is <exception>
#include <iostream>
#include <exception>
using namespace std;
 
struct MyException : public exception
{
  const char * what () const throw ()
  {
    return "C++ Exception";
  }
};
 
int main()
{
  try
  {
    throw MyException();
  }
  catch(MyException& e)
  {
    std::cout << "MyException caught" << std::endl;
    std::cout << e.what() << std::endl;
  }
  catch(std::exception& e)
  {
    //其他的错误
  }
}
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