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 andlt;iostream>
#include andlt;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 andlt;andlt; "Invalid input: " andlt;andlt; e.what() andlt;andlt; 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?

Revati S Misra

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