CareerCup

public class PRandom{
 int random_seed;
 void seed(int random_seed) {
     this.random_seed = random_seed; 
 }
 int rand() {
     random_seed = random_seed * 1103515245 +12345;
     return (int)(random_seed / 65536) % 32768;
 }
}

You should initially seed the psudo random generator with a number such as the current time since that will be different at every runtime.

Otherwise just hook up a geiger counter to the computer and look at the radioactive decay, that is truly random.

otherways to find the initial random seed : 1. time of day 2. GetPid

An example of a simple pseudo-random number generator is the Multiply-with-carry method invented by George Marsaglia. It is computationally fast and has good (albeit not cryptographically strong) randomness properties (note that this example is not thread safe):[6]
m_w = <choose-initializer>; /* must not be zero */
m_z = <choose-initializer>; /* must not be zero */

uint get_random()
{
m_z = 36969 * (m_z & 65535) + (m_z >> 16);
m_w = 18000 * (m_w & 65535) + (m_w >> 16);
return (m_z << 16) + m_w; /* 32-bit result */
}