DYNAMIC MEMORY ALLOCATION -

#include <stdio.h>
#include <stdlib.h>
int main()
{
int choice;
printf("\nMenu:\n");
printf("1. Enter elements\n");
printf("2. Reallocate memory\n");
printf("3. Print elements\n");
printf("4. End\n");
while(1)
{
    printf("Enter your choice (1-4): ");
    scanf("%d",&choice);
  int n,n1,*ptr,*ptr1;
  if(choice==1) {
  printf("Enter the size: ");
  scanf("%d",&n);
  ptr=(int *)malloc(n*sizeof(int));
  printf("Enter the elements: ");
  for(int i=0;i<n;i++)
  {
      scanf("%d",&ptr[i]);
  }
//   continue;
  }
 else if(choice==2) {
  printf("Enter the size for reallocation: ");
  scanf("%d",&n1);
  ptr1=(int *)realloc(ptr,(n+n1)*sizeof(int));
  ptr=ptr1;
    printf("Enter the elements for reallocation: ");
  for(int i=n;i<n+n1;i++)
  {
      scanf("%d",&ptr1[i]);
  }
//   continue;
 }
else if(choice==3) {
  printf("The Elements are: ");
  for(int i=0;i<n+n1;i++)
  {
      printf("%d",ptr[i]);
  }
}
else if(choice==4) {
  printf("Exit the program");
 break;
}
else
{
    printf("Invalid choice");
    // continue;
}
}
}