How to handle an "invalid input" Exception, like entering a character instead of an integer?

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Aryan Kumar · Answer

To handle an invalid input exception like entering a character instead of an integer in C++, you can use the following steps:

Use a try-catch block. A try-catch block is a way to handle errors in a controlled way. The try block contains the code that you are trying to execute. If an error occurs, the catch block will be executed.
Use the std::invalid_argument exception. The std::invalid_argument exception is thrown when an invalid argument is passed to a function.
Handle the exception gracefully. This could involve logging the error, displaying a message to the user, or taking some other action.

Here is an example of how to handle an invalid input exception in C++:

C++

#include <iostream>
#include <stdexcept>

using namespace std;

int main() {
  int number;

  try {
    // This will throw an invalid_argument exception if the user enters a character
    cin >> number;
  } catch (invalid_argument e) {
    // Handle the exception gracefully
    cout << "Invalid input: " << e.what() << endl;
  }

  return 0;
}

In this example, the try block contains the code that tries to read an integer from the user. If the user enters a character instead of an integer, the invalid_argument exception will be thrown and the catch block will be executed. In the catch block, we simply print a message to the user indicating that the input is invalid.

It is important to note that not all invalid input exceptions are thrown as invalid_argument exceptions. For example, if the user enters a string that is not an integer, a std::runtime_error exception will be thrown. If you need to handle all invalid input exceptions, you can use the std::exception exception.

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How to handle an "invalid input" Exception, like entering a character instead of an integer?

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