C + + Exception 1

include <iostream>                                                                 #include  <cstdio>using  namespace std;class a{public:    a (void) {cout <<  "A::A ()"  << endl;}     ~a (void) {cout <<  "a::~a ()"  << endl;}}; Int func3 (void) {    a a;    file *fp = fopen ( "None.txt", "R");     if (!FP) {        throw -1 ;//Throws an exception, jumps to the current scope "}", this exception can be either a basic type or a class type         cout <<   "FUNC3"   << endl;//do not perform     }       fclose (FP);     return 0;} Int func2 (void) {    a a;    func3 (); After the//FUNC3 function throws an exception, In the function Func2 is not able to handle, the exception is then thrown,             //so Z jumps directly to this scope "} "    cout << " Func2 " << endl;//will not execute      return 0;//does not perform}int func1 (void) {&NBSP;&NBSP;&NBSP;&NBSP;A&NBSP;A;&NBSP;&NBSP;&NBSP;&NBSP;FUNC2 ( );//func1 failed to handle exceptions from FUNC2, throwing exceptions, jumping directly to the scope of "}"     cout <<  "Func1"  < < endl;//do not perform     return 0;//do not perform}int main (void) {     Try{        func1 ();         //     }    catch (INT&NBSP;EX) {//try statement block below must be a catch statement block, other statements are error, here the catCH Capture                    //to the exception, and then continue to execute .     cout <<  "ex="  << ex < < endl;        cout <<  "file open  Error " << endl;        return -1;     }    return 0;}

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C + + Exception 1