Working with random integers

Here is the assignment: For this program, there are two "parts". The first part will run the trials and determine how many caps each trial opens before finding a winning cap. Every trial (person) will be a winner. The number of caps opened by each trial is written to the file. (The output file should contain only integers). (This is where you will use nested loops...a for and a while...not two for's)

The second part of the program will read in the values and calculate the average. The average should be between 4.5 and 5.5 since there is a 1 in 5 chance of winning.

I know I have many mistakes, I want someone to tell me where to start. I do not know much about java.

My code:

  int randNum = 0; 
  Random randNumList = new Random(); 

  int counter = 0;
  Scanner in = new Scanner(System.in);
  System.out.println("How many trials will there be?");
  int trials = in.nextInt();

  int winner = 0;

  PrintWriter outFile = new PrintWriter (new File("cap.txt")); 
  //run trials
  for (int loop = 1; loop <= trials; loop++)    
  {  
    //select random number until 5 is selected
    randNum = randNumList.nextInt(6);
    for (randNum = randNumList.nextInt(6); randNum == 5; randNum++)
    { 
      randNum = randNumList.nextInt(6);
      counter++;
    }

    outFile.println(loop + " " + randNum);
  }   


  outFile.close ( );    //close the file when finished 

  String token = " ";
  Scanner inFile = new Scanner(new File("cap.txt")); 

  while (inFile.hasNext())
  {      
       token = inFile.next();
       if(token.equals("5"))
         winner++;  
  }

  double average = winner/counter;
  System.out.println("The average number is " + average);

Random CSS value

I have this page where I have 3 triangles made purely out of CSS. Every time someone loads the page I want the triangle to have different sizes.

Here's the thing illustrated in a JSFiddle : http://ift.tt/1AK9ZMz

What I would like to do is to randomly set the value of border-width of every triangle at page load.

I was thinking doing that with JavaScript with a Math.random or something but I didn't manage to do it, nor found some help on the internet (I don't know how to write in Javascript).

I would appreciate a little help or guidance for this. Thanks a lot

Repetitive usage of Java's SecureRandom

I'm a little bit confused about the usage of SecureRandom. I need to generate n random numbers in a loop. Is it secure to use the same SecureRandom instance for each generation? Are there any difference between the solutions below in terms of cryptographic strength?

1) Single instance without seeding

SecureRandom sr = new SecureRandom();
for(int i = 0; i < n; ++i) sr.nextInt();

2) New instance for each generation

for(int i = 0; i < n; ++i) new SecureRandom().nextInt();

3) Single instance with seeding

SecureRandom sr = new SecureRandom()
for(int i = 0; i < n; ++i) {
    byte[] seed = sr.generateSeed(32);
    sr.setSeed(seed);
    sr.nextInt();
}

Cross-platform cross-language cross-everything actually deterministic random number generator

I'm looking for an algorithm to generate random numbers from a given seed but with the particular requirement that it will always generate the same sequence of number regardless of the underlying computer architecture or language implementation.

I already know of Mersenne Twister, however, the numbers it generates differ when using different implementations (i.e. C MT vs Javascript MT).

Do algorithms with this property exist? Also, I don't need a state-of-the-art RNG, I don't even need it to be cryptographically secure, I just want to drive a "random" simulation on one place and have it follow the same behavior on a different implementation.

random generator and openCV in c++

This is my function for generating random white noise in openCV and c++. Can anyone point me to the real problem ?

int i,j;

int h = image.cols;
int w = image.rows;

for(int k=0; k<n ; k++)
{

    i = Random(h);
    j = Random(w);


    if(image.channels() == 1)
    {
        image.at<uchar>(j,i) = 255;
    }
    else if (image.channels() == 3)
    {
        image.at<cv::Vec3b>(j,i)[0] = 255;
        image.at<cv::Vec3b>(j,i)[1] = 255;
        image.at<cv::Vec3b>(j,i)[2] = 255;

    }

}

![enter image description here][1]

How to use a random generated number in a parameter

So i am trying to change the enemies health based on a randomly number. When I try to pass a number using the random class I get an error:

The method changeEnemyHealth(int, int) in the type enemyStats is not applicable for the arguments (int)

And the code:

int enemyDamage = Random_damage.nextInt(31) + 270;
enemyStats.changeEnemyHealth(enemyDamage);
playerStats.changePlayerMana(-4);

public class enemyStats{

public static void changeEnemyHealth(int EHealth){
        EnemyHealth += EHealth;
    }
}

Random Choice is out of list range in Python?

I am trying to create a program that will guess the number you entered. I was trying to get the computer to get the number in as few guesses as possible so I am doing something like a binary search. I keep getting a Index out of range when I run the code and it gets to total = total[the_low_one:computer2_guess]. I am confused why it is out of range. Should I be adding or subtracting one to the_low_one each time it hits a new low so it stays in range? I would appreciate any help as I am lost. Thanks a bunch in advance! Code:

def second_computer():
    global computer2_score
    computer2_score=0
    computer2_guess= -1
    the_low_one=1
    the_high_one=1000000
    total= range(1,1000000)
    while computer2_guess != pick_number:
        computer2_guess=random.choice(total)
        if computer2_guess>pick_number:
            total=total[the_low_one:computer2_guess]
            the_high_one=computer2_guess-1
        else:
            total=total[computer2_guess:the_high_one]
            the_low_one=computer2_guess+1
        computer2_score+=1