C + + exception handling (Exception handling)

Three types of operators were introduced in C + + to handle the error of the program, namely:try, throw, catch

1. The basic usage is as follows:

Try {    //code to be tried    throw  exception;} Catch (Type exception) {    //codeto being executed in case of exception}

The operation process is:

(1) code in atry statement block executes normally, and when an exception occurs, the code throws an exception with the keyword throw and a parameter , This parameter can be any valid data type, it reflects the characteristics of the exception;

(2) When an exception occurs, where a throw in the try statement block is executed, thecatch statement block is executed, accepting arguments thrown from the throw .

Demo:

#include <iostream>using namespacestd;intMain () {Try    {        Char*mystring; MyString=New Char[ -]; if(mystring = =NULL)Throw "Allocate Failure";  for(inti =0; I <= -; i++)        {            if(I > +)Throwi; Mystring[i]='a'; }    }    Catch(intI//executes when the argument thrown by the throw is of type int{cout<<"Exception:index"<< I <<"is out of range."<<Endl; }    Catch(Char* str)//executed when throw throws a parameter of type char* (string){cout<<"Exception:"<< Str <<Endl; } System ("Pause"); return 0;}

Result

C + + exception handling (Exception handling)