#include <stdio.h> 
#include <stdlib.h> 

main() 
{ 
	int* ptr; 
	int n, i, sum = 0; 

	n = 5; 
	// Dynamically allocate memory using malloc() 
	ptr = (int*) malloc(n* sizeof(int)); 

		for (i = 0; i < n; ++i) { 
			ptr[i] = i + 1; 
		} 

		printf("The elements of the array are: \n"); 
		for (i = 0; i < n; ++i) { 
			printf("%d, ", ptr[i]); 
		} 

		// Get the new size for the array 
		n = 10; 

		// Dynamically re-allocate memory using realloc() 
		ptr =(int*) realloc(ptr, n * sizeof(int)); 

		for (i = 5; i < n; ++i) { 
			ptr[i] = i + 1; 
		} 

		printf("\nThe elements of the array are: \n"); 
		for (i = 0; i < n; ++i) { 
			printf("%d, ", ptr[i]); 
		} 

		free(ptr); 
	}