#define size count
int arr[size];

#include "stdlib.h"
#include "stdio.h"

int main()
{
  int* array;
  int number;
  int index; 

  printf("How many integers do you want to enter? ");
  scanf("%d",&number);
  array = (int*) malloc(number*sizeof(int));
  for(index=0;index<number;index++){
    printf("Enter #%d: ",index);
    scanf("%d",&array[index]);
  }
  printf("\nHere are your numbers\n");
  for(index=0;index<number;index++)
    printf("Number #%d is %d\n",index,array[index]);
 }

#include <iostream>
#include <cstdlib>
using namespace std;

class MyArray {
 public:
   MyArray() : capacity(4), size(0) { // initial array size is 4 or int data[4]
     data = new int[capacity];
   }
   void add(int n) { //input data function
     if (size==capacity)  // if input data is = max size of array
        increaseCapacity();// resize the array
     data[size] = n;
     size++; // counter the array size
   }
   int get(int index) {
     return data[index];
   }    
   void set(int index, int value) {
     data[index] = value; 
   }    
   void display() {
     for (int i=0;i<size;i++)
        cout << data[i] << " ";
   }
 private:
   void increaseCapacity() {  // increase array size when input > 4
     capacity *= 2; // increase array size to double;array size is data[8]

     int* newdata = new int[capacity]; // create new array
     for (int i=0;i<size;i++)
        newdata[i] = data[i]; // copy all data from old array to new array
     delete[] data; // delete data memory allocated in int *data
     data = newdata;// copy all data from newdata to data again
  }// once exit this fucntion, newdata will automatic deleted
  int* data; // data pointer to memory
  int size, capacity;
};

int main() {
 MyArray m;
 for (int i=0;i<10;i++) // input data more than 4
    m.add(i*2);
 m.display();   
}