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#include <stdlib.h>
#include <string>   // for string, substring
#include <sstream>  // for stringstream
#include <iostream> // for cout, puts etc.
#include <stdio.h>  // for  sprintf, printf( "%lf\n", accum );
#include <time.h>   // time
#include <fcntl.h>  // open()
#include <unistd.h> // read()
#include <iomanip>  // for setw
#include <fstream>  // for ifstream
#include <cstring>  // for memcpy, placed in the std namespace
#include <cstddef>  // for size_t

using namespace std; // allows get rid of std:: prefix.