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crandomcode-translation

Exact C equivalent of Java Random.nextInt(int bound) method

I am working on a project that I port some Java code into C. Everything has gone well until now but I'm stucked at porting Random.nextInt(int bound) method into C.

My Java code is:

int arr[] = new int[100000];
Random r = new Random(0);
for (int i = 0; i < 100000; i++)
    arr[i] = r.nextInt(20);

where arr array has always the same contents (after each execution) which is normal.

My equivalent C code is:

int arr[100000], i;

srand(0);
for (i = 0; i < 100000: i++)
    arr[i] = rand() % 20;

The contents of two arr arrays are not same.

I thought to print the generated random numbers to a file in Java code in order to use them (the numbers) as a constant array in C code instead of using rand() function but the size of the array will be so huge which will prevent me to do this because the C code will work on an embedded device (microcontroller).

My question is how can I port that Java code into C where I can obtain the same random numbers?

Solution

  • Java JDK sources are publicly available.

    If you want an exact equivalent of Java's random number generator in C, go grab the sources and write/port it yourself.