//1. wap to demonstrate try, throw and catch using your own example.
#include <iostream>
using namespace std;

int main() {
    int numerator, denominator, result;
    cout << "Enter numerator and denominator: ";
    cin >> numerator >> denominator;

    try {
        if (denominator == 0) {
            throw logic_error("Can't divide by zero!");
        }
        result = numerator / denominator;
        cout << "Result is: " << result << endl;
    } catch (logic_error e) {
        cout << "Exception: " << e.what() << endl;
    }
}
//2. wap to accept email address from user and throw an exception if it does not contain '@' symbol
#include <iostream>
#include <string>
using namespace std;

int main(){
    string email;
    cout << "Enter email address";
    cin >> email;
    int len = email.length();
    bool found = false;
    try{
        for(int i=0; i< len; i++){
            if(email[i]=='@'){
           found = true;
           break;
            }
        }
                if(!found){
            throw runtime_error("Email is incorrect");
            }
                cout << "Correct email.";
        
        }catch(runtime_error e){
            cout <<"Exception: "<<e.what();
    }
}
// 3. wap to perform division operation on two numbers and throw an exception if divisor  is zero.
#include <iostream>
using namespace std;

int main() {
    int divisor, divident, result;
    cout << "Enter divisor and divident: ";
    cin >> divisor >> divident;

    try {
        if (divisor == 0) {
            throw logic_error("Can't divide by zero!");
        }
        result = divident / divisor;
        cout << "Result is: " << result << endl;
    } catch (logic_error e) {
        cout << "Exception: " << e.what() << endl;
    }
}
//4. wap to accept username and password from user and throw an exception if password has less than 6 characters or doesn't contain a digit
#include <iostream>
using namespace std;
int main(){
    string username, pass;
    cout << "Enter username: "<<endl;
    cin >> username;
    cout << "Enter password: " << endl;
    cin >> pass;
    int passLength = pass.length();
    bool isCorrect = false;
    try{
        if(passLength < 6){
            throw logic_error("Password's length is less than 6.");
        }
        for(int i=0 ; i<passLength ; i++){
           if(isdigit(pass[i])){
           isCorrect = true;
           break;
           }
        }
        if(!isCorrect){
            throw logic_error("Password must contain at least a digit.");
        }
        cout << "waau correct username and password!";
    } catch(logic_error e){
        cout << "Exception: "<<e.what();
    }
}

// 5. wap that attempts to open a file named "input.txt" for reading, user exception handling to catch and handle the case if the file doesn't exist.
#include <iostream>
#include <fstream>
using namespace std;

int main() {
    ifstream file;
    try {
        file.open("input.txt");
        if (!file.is_open()) {
            throw runtime_error("File not found");
        }
        string line;
        while (getline(file, line)) {
            cout << line << endl;
        }

        file.close();
    } catch (const exception &e) {
        cout << "Exception: " << e.what() << endl;
    }
    return 0;
}

 // NOTE: 6 ko Question matra ho idk how to do!
 
// 6. wap that repeatedly prompts a user for numeric input. use exception handling to ensure input is valid integer and handle exception if input is not an integer.
// Get output pdf file at: https://docs.sujan1919.com.np/uploads/oop-lab-6-output.pdf