Удаляется exe файл при попытке компиляции

#pragma once
#include <string>
 
using namespace std;
 
class book{
    private:
        string author;
        string title;
        string publisher;
        int year;
        int pages;
    public:
        book();
        book(string inauthor, string intitle, string inpublisher, int inyear, int inpages);
        book(const book& orig);
 
        ~book();
 
        void setauthor(string inauthor);
        void settitle(string intitle);
        void setpublisher(string inpublisher);
        void setyear(int inyear);
        void setpages(int inpages);
 
        string getauthor();
        string gettitle();
        string getpublisher();
        int getyear();
        int getpages();
 
        void show();
};

#include "book.h"
#include <iostream>
 
book::book(){
    author="";
    title="";
    publisher="";
    year=0;
    pages=0;
}
 
book::book(string inauthor, string intitle, string inpublisher, int inyear, int inpages){
    author=inauthor;
    title=intitle;
    publisher=inpublisher;
    year=inyear;
    pages=inpages;
}
 
book::book(const book& orig){
    author=orig.author;
    title=orig.title;
    publisher=orig.publisher;
    year=orig.year;
    pages=orig.pages;
}
 
book::~book(){
}
 
void book::setauthor(string inauthor){
    author=inauthor;
}
void book::settitle(string intitle){
    title=intitle;
}
void book::setpublisher(string inpublisher){
    publisher=inpublisher;
}
void book::setyear(int inyear){
    year=inyear;
}
void book::setpages(int inpages){
    pages=inpages;
}
 
string book::getauthor(){
    return author;
}
string book::gettitle(){
    return title;
}
string book::getpublisher(){
    return publisher;
}
int book::getyear(){
    return year;
}
int book::getpages(){
    return pages;
}
 
void book::show(){
    cout<<"Book's author: "<<author<<"\n"
    <<"Book's title: "<<title<<"\n"
    <<"Book's publisher: "<<publisher<<"\n"
    <<"Book's year of release: "<<year<<"\n"
    <<"Number of pages in the book: "<<pages<<"\n \n";
}

#include "book.h"
#include <iostream>
#include <vector>
 
void menu(){
    cout<<"    Choose an option \n"
    <<"1: Add new books to the list \n"
    <<"2: Get a list of books of the same author \n"
    <<"3: Get a list of books with less pages than a certain amount \n"
    <<"4: Get a list of books published after a certain year: \n"
    <<"5: Close the program \n \n";
}
 
book donation(int iter){
    string newauthor;
    string newtitle;
    string newpublisher;
    int newyear;
    int newpages;
 
    cout<<iter<<" Enter the book's author: ";
    cin>>newauthor;
    
    cout<<" Enter the book's title: ";
    cin>>newtitle;
 
    cout<<" Enter the book's publisher: ";
    cin>>newpublisher;
 
    cout<<" Enter the book's year of release: ";
    cin>>newyear;
 
    cout<<" Enter the book's number of pages: ";
    cin>>newpages;
 
    book newbook(newauthor, newtitle, newpublisher, newyear, newpages);
 
    return newbook;
}
 
 
int main(){
    int amount;
    string key="";
    string prefauthor;
    int prefpages;
    int prefyear;
    vector <book> library={};
    while (1){
        menu();
        cin>>key;
        if (key=="1"){
            cout<<"\n How many books do you want to add? \n";
            cin>>amount;
            for (int i=0; i<amount; i++){
                book addbook=donation(i+1);
                library.push_back(addbook);
                cout<<"\n";
            }
        }
        else if (key=="2"){
            cout<<"Whose books do you want to see: \n";
            cin>>prefauthor;
            cout<<"\n";
            for (int i=0; i<library.size(); i++){
                cout<<"Book "<<i+1<<": \n";
                if (library[i].getauthor()==prefauthor){
                    library[i].show();
                }
            }
            system("pause");
        }
        else if (key=="3"){
            cout<<"How many pages are too many for you: \n";
            cin>>prefpages;
            cout<<"\n";
            for (int i=0; i<library.size(); i++){
                cout<<"Book "<<i+1<<": \n";
                if (library[i].getpages()<=prefpages){
                    library[i].show();
                }
            }
            system("pause");
        }
        else if (key=="4"){
            cout<<"Whose books do you want to see: \n";
            cin>>prefyear;
            cout<<"\n";
            for (int i=0; i<library.size(); i++){
                cout<<"Book "<<i+1<<": \n";
                if (library[i].getyear()>prefyear){
                    library[i].show();
                }
            }
            system("pause");
        }
        else if (key=="5"){
            break;
        }
        else{
            cout<<"kill yourself \n";
            system("pause");
        }
    }
}