please, can you write a code in C++ for input and output files for all these structs for a patients?

//Global variables

const int SIZE=100; //global constant

int count=0; //actual size of array

//Structures Declaration

struct Date

{

int day;

int month;

int year;

};

//end of struct Date

struct staff

{

string id;

string name;

char gender;

Date dob;

string blood_type;

} pt[SIZE]; //global array of struct Staff