Exception

#include <iostream>
#include <fstream>
#include<cstdio>
#include<stdio.h>
#include <string>

using namespace std;

class FileOp {
    char data[256] = { 0 };
    public:
        void readData() {
        cout << "Please Inpute Data:\n";
        //cin >> data;
        cin.getline(data, 1000);
        //cout << data << endl;
    }
    void CreateFile() {
        string filename;
        cout << "Please Inpute File Name:\n";
        cin >> filename;
        cin.ignore();
        readData();
        ofstream file(filename);
        if (file.is_open()) {
            file<< data;
            file.close();
            cout << "File Create Sucess.";
        }
    }

    void readFile() {
        string fileName;
        string data;

        cout << "Input file Name:\n";
        cin >> fileName;

        ifstream file(fileName);


        if (file.is_open()) {
            getline(file, data);
            cout << "Data=" << data;
        }

    }

    void appenddata() {
        string filename;
        cout << "Please Inpute File Name:\n";
        cin >> filename;
        cin.ignore();
        readData();

        ofstream file(filename,ios::in|ios::app);
        if (file.is_open()) {
            file << data;
            file.close();
            cout << "File Create Sucess.";
        }
    }

    void DeleteFile() {

        string filename;
        cout << "Please Inpute File Name:\n";
        cin >> filename;

        int r= remove(filename.c_str());
        cout << "Result=" << r;
    }

    void createAccount() {
        string acc;
        cout << "Input Account Number:\n";
        cin >> acc;
        cout << acc + "p.txt" << endl;
        cout << acc + "b.txt" << endl;

        ofstream file_p(acc + "p.txt");

        if (file_p.is_open()) {
            //Input Nmae
            cin.ignore();
            char name[100] = { 0 };
            cout << "Input Name:\n";
            cin.getline(name, 100);
            //Write in File
            file_p << "Name: " << name;


            cin.ignore();
            char mobile[100] = { 0 };
            cout << "Input Mobile:\n";
            cin.getline(mobile, 100);
            //Write in File
            file_p << "Mobile: " << mobile;


            file_p.close();
        }

        ofstream file_b(acc + "b.txt");
        file_b.close();

    }

};

int main() {


    try {
        int a, b;
        a = 10;
        b = 10;

        //======Validation=====
        if (b == 0 || a == 0) {
            throw "Error Invalid Input";
        }


        int c = a / b;
    }catch (const char* e) {
        cout << "Error:" << e;
    }

    try {
        int a[3];
        a[0] = 1;
        a[1] = 3;
        a[3] = 4;
    }catch(const char* c){}


    return 0;

}