New и malloc

#include <iostream>
 
//========================================
 
int main()
{
    auto i1 = new int[10];
    auto i2 = (int*) malloc(10);
 
    auto it1 = i1;
    auto it2 = i2;
 
    while (it1 != i1 + 10)
        std::cout << *it1++ << " ";
    std::cout << std::endl;
 
    while (it2 != i2 + 10)
        std::cout << *it2++ << " ";
    std::cout << std::endl;
 
    delete[] i1;
    free(i2);
 
 
    return 0;
}

void* p1 = operator new(/*bla-bla-bla*/);//operator new
int* p2 = new int(/*bla-bla-bla*/);//new-expression (first alternatives)
int* p3 = new int[/*bla-bla-bla*/];//new-expression (second alternatives)

#include <iostream>
#include <conio.h>
#include <ctime>
using namespace std;
 
int main()
{
    time_t t0, t1, t2;
    t0 = clock();
    for (int i=0; i < 0xfffff; i++)
    {
        for (int k=0; k < 0xff; k++)
        {int a=0;}
    }
    t1 = clock()-t0;
    cout << "empty " << (double)(t1/CLOCKS_PER_SEC) << " sec." << endl;
    t0 = clock();
    for (int i=0; i < 0xfffff; i++)
    {
        for (int k=0; k < 0xff; k++)
        {
            int *a = new int [10];
            delete [] a;
        }
    }
    t2 = clock()-t0;
    cout << "new/delete " << (double)(t2/CLOCKS_PER_SEC) << " sec. Difference = " << (double)((t2-t1)/CLOCKS_PER_SEC) << " sec." << endl;
    t0 = clock();
    for (int i=0; i < 0xfffff; i++)
    {
        for (int k=0; k < 0xff; k++)
        {
            int *a = (int*) malloc(40);
            free(a);
        }
    }
    t2 = clock()-t0;
    cout << "malloc/free " << (double)(t2/CLOCKS_PER_SEC) << " sec. Difference = " << (double)((t2-t1)/CLOCKS_PER_SEC) << " sec." << endl;
 
_getch();
}