Java Program to Implement Park-Miller Random Number Generation Algorithm

This is java program to generate the random numbers, using the Park-Miller algorithm.Park–Miller random number generator (after Stephen K. Park and Keith W. Miller), is a variant of linear congruential generator (LCG) that operates in multiplicative group of integers modulo n. A general formula of a random number generator (RNG) of this type is, x(n+1) = g*x(n) mod n.

Here is the source code of the Java Program to Implement Park-Miller Random Number Generation Algorithm. The Java program is successfully compiled and run on a Windows system. The program output is also shown below.

//This is a sample program to random numbers using Park Miller Random Numbers algorithm

public class Park_Miller_Random_Numbers

```
{
```
```
    static final long m = 2147483647L;
```
```
    static final long a = 48271L;
```
```
    static final long q = 44488L;
```
```
    static final long r = 3399L;
```
```
 
```
```
    static long r_seed = 12345678L; 
```
```
 
```
```
    public static double uniform ()
```
```
    {
```
```
        long hi = r_seed / q;
```
```
        long lo = r_seed - q * hi;
```
```
        long t = a * lo - r * hi;
```
```
        if (t > 0)
```
```
            r_seed = t;
```
```
        else
```
```
            r_seed = t + m;
```
```
        return r_seed;
```
```
    }
```
```
 
```

    public static void main (String[] argv)

```
    {
```
```
        double[] A = new double [10];
```
```
 
```
```
        for (int i=0; i<5; i++) 
```
```
            A[i] = uniform();
```
```
 
```
```
        for (int i=0; i<5; i++) 
```

            System.out.print ("  " + A[i]);

```
    }
```
```
}
```

Output:

$ javac Park_Miller_Random_Numbers.java
$ java Park_Miller_Random_Numbers
1.085252519E9  5.08259731E8  1.352291773E9  1.563240271E9  8.90733155E8 ...

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