如何将const char ** path分配为字符串？

Question

I want to get the working executable directory at runtime for OS X. I found this code below, but I don't know how to use the const path as a string. It's complaining that:

testingtesting.cxx:7:30: warning: format specifies type 'char *' but the
  argument has type 'const char **' [-Wformat]
printf("path is : %s\n", path);

I want to assign the const char ** path as a string. Here is the code below:

#include <stdlib.h>
#include <stdio.h>
#include <string>
#include <iostream>

using namespace std;

int main (int argc, const char *argv[], const char *env[], const char *path[]) {
  // path[0] now contains the path to the executable
  // NOT PORTABLE! OS X ONLY!

    std::string s = path.c_str();

    printf("path is : %s\n", s);
  return 0;
}

Answer 1

Change:

std::string s = path.c_str();

printf("path is : %s\n", s);

to:

std::string s(path[0]); // create C++ std::string and initialise
                        // from C string `path[0]`

std::cout << "path is : " << s << std::endl;