write a program to de-allocate the memory then free the allocated memory.

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
int main()
{
int n,i;
int *ptr;
printf("enter the no. of elements:");
scanf("%d",&n);
ptr=(int*)malloc(n*sizeof(int));
printf("memory allocated using malloc\n");
for(i=0;i<n;i++)
{
ptr[i]=i+1;
}
free(ptr);
printf("\nmemory freed");
return 0;
}