zero string

#include <iostream>
#include "stdio.h"
#include "stdlib.h"
#include <cassert>

using namespace std;

std::string zero_string() {
    char *zero = new char[2];
    zero[0] = 1;
    zero[1] = 0;
    auto str = std::string(zero);
    str[0] = 0;
    delete[] zero;
    return str;
}

void make() {
	char *st = new char[5];
   st[4] = 0;
   st[0] = 97;
   st[1] = 98;
   st[2] = 99;
   st[3] = 100;
   puts(st);
   
   std:string str = std::string(st);
   printf("%ld\n", str.length());
   puts(str.c_str());
   str[3] = 0;
   printf("%ld\n", str.length());
   puts(str.c_str());
   puts(st);

   printf("\n\n");
   std::string zero = zero_string();
   printf("%ld\n", zero.length());
   char *another_zero = new char[2];
   another_zero[0] = 0;
   another_zero[1] = 0;
   const char *cstr = zero.c_str();
   printf("%d::%d", cstr[0], another_zero[0]);
   assert(cstr[0] == another_zero[0]);
   printf("%d::%d", cstr[1], another_zero[1]);
   assert(cstr[1] == another_zero[1]);
   //assert(cstr[2] == another_zero[2]);
   delete[] another_zero;
}



int main()
{
   cout << "Hello World" << endl;
   make();
   return 0;
}