C++ allocate lots of memory (for testing)

memory.cpp

#include <iostream>
#include <new>
#include <cstdlib>
int main()
{
        int i=0;
        char* ptr =NULL;
        while(i<50){
                if ((ptr =(char*)malloc(1048576)) == NULL) {///1MB allocated
                        std::cout << "Allocation fails at " << i << "MB\n";
                        return 0;
                }
                std::cout << "Allocated "<< i+1 << "MB\n";
                i++;
        }
        std::cout << "Finished allocation";
        return 0;
}