CPP Chatbot

#include <iostream>
#include <string>
#include <fstream>
#include <map>
using namespace std;
map<string,string> m;
void answer(){
-string q;
-cin.ignore();
-getline(cin,q);
-if(m[q]!="")
--cout<<m[q]<<endl;
-else
--cout<<"i donnot understand question\\n";
}
int main() {
-fstream gchat("gammal_chat_bot.txt");
-if(gchat.is_open()){
--start:
---string q,a;
---while(getline(gchat,q)){
----getline(gchat,a);
----m[q]=a;
---}
---gchat.close();
---cout<<"what would you like to do?\\n"
------"1.Add Q&A\\n"
------"2.Ask a question\\n"
------"3.Exit\\n";
---int ans;
---cin>>ans;
---if(ans==1){
----cout<<"Type the question:\\n";
----cin.ignore();
----getline(cin,q);
----cout<<"Type the answer\\n";
----getline(cin,a);
----m[q]=a;
----gchat.open("gammal_chat_bot.txt",ios::app);
----gchat<<q<<endl<<a<<endl;
----gchat.close();
---}
---else if(ans==2)
----answer();
---else
----return 0;
-goto start;
----}
-else
--cout<<"Error:cannot open file\\n";
}