meomory-din_alloc

#include <iostream>
#include <stdlib.h>
using namespace std;

int main()
{
int x[100];
cout<<sizeof(x)<<endl;
int* ptr;
ptr =(int*)malloc(10 * sizeof(*ptr));
cout<<static_cast<bool>(ptr==NULL)<<endl;
for (int i=0;i<10;i++)
    *(ptr+i)=i;
  for (int i=0;i<10;i++)
    cout<<*(ptr+i)<<' ';
    cout<<endl;
    int* ptr2;
    ptr2=(int*)calloc(10,sizeof(int));
cout<<static_cast<bool>(ptr2==NULL)<<endl;
*(ptr2+1)=3;cout<<*(ptr2+1)<<endl;
free(ptr2);
cout<<*(ptr2+1);
ptr=(int*)realloc(ptr,10*sizeof(long));
  return 0;
}