c++

#include <iostream>
#include <string>
#include <vector>
#include <fstream>
#include <sstream>
#include <array>
/* Look at the search_patient function */
using namespace std;

int menu(){
    int option;
    std::cout << "------------N.E.N HOSPITAL RECORDS----------\n";
    std::cout << "1- Create Patient ID\n";
    std::cout << "2- All Patients\n";
    std::cout << "3- Query patient with id\n";
    std::cout << "4- Exit\n";
    std::cout << "Enter query: ";
    std::cin  >> option;
    return option;

}
void create_patient(){
    char first_name[100], last_name[100], ailment[100], sex;
    int age;
    getchar();
    std::cout << "\n-----------------Patient creation--------------\n";
    ofstream Patients("patients1.txt",ios::app);
    std::cout << "Enter First Name: ";
    gets(first_name);
    std::cout << "Enter Last Name:  ";
    gets(last_name);
    std::cout << "Enter Sex: ";
    std::cin >> sex;
    getchar();
    std::cout << "Enter Ailment: ";
    gets(ailment);
    std::cout << "Enter Age: ";
    std::cin >> age;
    std::cout << "First Name: " << first_name << "\n";
    std::cout << "Last Name: " << last_name << "\n";
    std::cout << "Age: " << age <<"\n";
    std::cout << "Ailment: "<< ailment << "\n";
    cout << "Sex: " << sex << "\n";
    Patients << first_name <<" "<< last_name << " " << age <<" "<< ailment<<" "<< sex <<"\n";
    Patients.close();
}
void show_all_patients(){
    cout << "-----PATIENTS LIST-----\n";
    FILE *p;
    char ch;
    p = fopen("patients1.txt","r");

    }
}

void search_patient(){
    /* How do i query from this :( */
    cout << "-----PATIENTS QUERY-----\n";
    FILE *p;
    char ch = ;
    p = fopen("patients1.txt","r");
    ch = fgetc(p);
    while(ch!=EOF){
        ch = fgetc(p);
    }
}
int main(){
    int query = menu();
    if (query >= 1 && query <= 4){
       cout << query << " Query Accepted!" << "\n";
       switch(query){
       case 1:
       cout << "Creating new id!\n";
       create_patient();
       break;
       case 2:
       cout << "Showing all patients!\n";
       show_all_patients();
       break;
       case 3:
       cout << "Querying Patient\n";
       search_patient();
       break;
       case 4:
       cout << "Exiting...";
       break;
       default:
       cout << "what?\n";
       }
    }
    else{
       cout << "Try again\n";
       main();
    }
    return 0;
}