C++ Exception handling Inside loop not working

Asked Jan 25 '19 at 16:16

Active Jan 25 '19 at 16:16

Viewed 34 times

Related question:

I found a similar question already posted here on stackoverflow but for some reason the answer doesn't work in my case.

My question:

I am not able to get out of the loop in the following code when I enter a non-integer value.

int main(){
  int num;
  do {
      cout << endl << "\tEnter number (enter anything other than a number to exit): ";
      try{
          cin >> num;
      }catch(...){
          break; // I also tried "return 1;", "exit(1);" with no success 
      }
  }while(1);
  return 0;
}

Please note that I am not an expert in c++.

asked Jan 25 '19 at 16:16

Ahtisham

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2

`std::cin` won't throw exceptions on failure. – Yksisarvinen Jan 25 '19 at 16:16
why ? In other programming languages like `python` that is not a problem – Ahtisham Jan 25 '19 at 16:17
5

Mostly because C++ is not Python. – Yksisarvinen Jan 25 '19 at 16:20
1

@Yksisarvinen While true, `cin` can actually be configured to throw, it is just not turned on by default since throwing is expensive. – NathanOliver Jan 25 '19 at 16:24
@Yksisarvinen In c++ exceptions are usually reserved for exceptional situations due to their relative cost. It's easy to argue that bad user input is not exceptional, it's typical. Though if you *want* throwing `cin` see [`std::basic_ios::exceptions`](https://en.cppreference.com/w/cpp/io/basic_ios/exceptions). – François Andrieux Jan 25 '19 at 16:31
guys I am getting an error: `numeric_limits is not a member of 'std'` – Ahtisham Jan 25 '19 at 16:33

C++ Exception handling Inside loop not working

0 Answers0