C++ Bc. 38 cpp

#include <iostream>
#include <cstdlib>
#include <ctime>

bool pokus(char[], int dim);

int main()
{
  char listek[] = {'r', 'o', 'k', 'o', 'k', 'o'};
  const int L   = sizeof(listek);  

  std::srand(std::time(0));   // inicializace generatoru rand()

  double soucet =0;
  double celkem = 0;

  std::cout.setf(std::ios_base::fixed, std::ios_base::floatfield);
  std::cout.precision(4);

  const int N = 1000000;
  for (int k=1; k<=10; k++)
    {
      int s = 0;
      for (int i=1; i<=N; i++)
        if (pokus(listek, L))
          s++;

      std::cout << double(s)/N << std::endl;

      soucet += s;
      celkem += N;
    }

  std::cout << "-------\n";
  std::cout << soucet/celkem << std::endl;
}

bool pokus(char text[], int dim)
{
  // vypocet nahodne permutace
  int k, i=dim;
  while (i>0)
    {
      k = int( i*(rand()/(RAND_MAX + 1.0)) );
      std::swap(text[--i], text[k]);
    }

  return text[0]=='k' && text[1]=='r' && text[2]=='o' && text[3]=='k';
}

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