Dynamic allocation in c++ using calloc/malloc and realloc.

#include<iostream>
#include<stdlib.h>
using namespace std;
main()
{
int *arr,m,n,i;
cout<<"Enter total no. of elements:";
cin>>n;
arr=(int *)malloc(n*sizeof(int)); //use of malloc
cout<<"\nEnter "<<n<<" elements:";
for(i=0;i<n;i++)
{
cin>>*(arr+i);
}
cout<<"Enter another total no. of elements:";
cin>>m;
arr=(int *)realloc(arr,m*sizeof(int)); //use of realloc
cout<<"Enter another "<<m<<" elements:";
for(i=n;i<m+n;i++)
{
cin>>*(arr+i);
}
cout<<"\nThe elements are:";
for(i=0;i<n+m;i++)
{
cout<<"\t"<<*(arr+i);
}
free(arr);
}

Output:-