# Java Program to Implement Park-Miller Random Number Generation Algorithm

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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.

1. `//This is a sample program to random numbers using Park Miller Random Numbers algorithm`
2. `public class Park_Miller_Random_Numbers `
3. `{`
4. `    static final long m = 2147483647L;`
5. `    static final long a = 48271L;`
6. `    static final long q = 44488L;`
7. `    static final long r = 3399L;`
8. ` `
9. `    static long r_seed = 12345678L; `
10. ` `
11. `    public static double uniform ()`
12. `    {`
13. `        long hi = r_seed / q;`
14. `        long lo = r_seed - q * hi;`
15. `        long t = a * lo - r * hi;`
16. `        if (t > 0)`
17. `            r_seed = t;`
18. `        else`
19. `            r_seed = t + m;`
20. `        return r_seed;`
21. `    }`
22. ` `
23. `    public static void main (String[] argv)`
24. `    {`
25. `        double[] A = new double ;`
26. ` `
27. `        for (int i=0; i<5; i++) `
28. `            A[i] = uniform();`
29. ` `
30. `        for (int i=0; i<5; i++) `
31. `            System.out.print ("  " + A[i]);    `
32. `    }`
33. `}`

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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