In the last line how do i make the size to be defined by the user? C++

#define _CRT_SECURE_NO_WARNINGS #include #include #include //library that helps in reading/writing to files #include #include //library for time

using namespace std;

int counter = 0; // changed the name to count as iostream has a counter that already exist const int SIZE = 10; //added this line

//Structures Declaration struct Date { int day; int month; int year; };//end of struct Date

struct Student { string id; string name; char gender; Date dob; double score; char grade; //computed by an internal function } st[SIZE];