Question

Must be done in C++.

Exceptions are normally looked at as error states in the program. Create an instance where an exception can be used to indicate a situation has occurred that can be handled instead of needing to end the program. Describe the use and how it could be used with a simple program. Post both the description and code.

Answer 1

#include <iostream>
#include <string.h>
#include <cstdlib>

using namespace std;

// Below method is supposed to provide input from user in integer 
// format
// it throws an error if user doesn't enter input in numeric format
int readInteger() { 
    string temp;
    getline(cin, temp);

    for (int i=0; i<temp.size(); i++)
        if (!isdigit(temp[i]))
            throw std::domain_error("Bad input");
        return atoi(temp.c_str());
}

int main() {
    bool valid = false;
    while(!valid) {

        try {
            cout << "Enter a number: ";
            int n = readInteger();
            cout << "you have entered " << n << endl;
            valid = true;
        } catch (exception& e) {
            cout << "An exception occurred. Reason: " << e.what() << '
';
        }
    }
}

In this code, We have created a function which is used to get the user input in numeric format. If user input is not numeric, then this can be corrected by prompting the user again. The code does the same, by using the exception and reprompting the user.

Please upvote, as i have given the exact answer as asked in question. Still in case of any concerns in code, let me know in comments. Thanks!