Find The error in this program

Question

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
int main()
{
int *ptr,n1,n2,i;
printf("enter the size of an memory");
scanf("%d",&n1);
ptr=(int*)malloc(n1*sizeof(n1));
printf("enter the elements");
for(i=0;i<n1;++i)
{
scanf("%d",ptr);
printf("%d\n",*ptr);
ptr++;
}

printf("enter new size of memory");
scanf("%d",&n2);
ptr = (int *) realloc(ptr, n2);
for(i=0;i<n2;++i)
{
scanf("%d",ptr);
printf("%d",*ptr);
ptr++;
}
}

Answer 1

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https://www.sololearn.com/Discuss/333866/?ref=app