Re: Strings, Arrays, c++ and java

Just to chime in and write the C++ in a more C++ style.


#include <iostream>
#include <cstdlib>
#include <ctime>
#include <string>
#include <algorithm>
#include <vector>

using namespace std;

const int len = 50000000;

struct myRandom
{
    char operator()() const { return std::rand() % 26 + 'a';}
};

int main( int argc, char *argv[])
{
    std::vector<char> data(len);

    clock_t start = clock();
    std::generate_n(&data[0],len,myRandom());
    std::string str(data.begin(),data.end());
    clock_t end = clock();

    std::cout <<"Time: " <<
            double(end-start)/CLOCKS_PER_SEC * 1000 << " ms" << std::endl;
}


import java.util.*;

public class Find{

 public static void main(String[] arg)
  {
         final int len = 50000000;

         long start = System.currentTimeMillis();
         String s = randomString(len);
         long end = System.currentTimeMillis();

        System.out.println("Time: " + (end - start) + " ms");
    }

 //returns a String of length l with lowercase letters from a to z
  static String randomString(int len)
  {
          char[] cr = new char[len];
          Random rd = new Random();
          for (int i = 0; i < len; i++){
             int num = rd.nextInt(26) + 97;
              cr [i] = (char) num;
         }

     return new String(cr);

  }


Time: 3654 ms
Time: 873.487 ms