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#include <libmary.h>
#include <arithmetical.h>
unsigned int random_seed;
void randomSeed(unsigned int seed)
{
random_seed = seed;
return;
}
// random algorithm using linear congruential method
unsigned int random(void)
{
int hi,lo,x;
x = random_seed;
if(x == 0)x = 123459876L;
hi = x / 127773L;
lo = x % 127773L;
x = 16807L * lo - 2836L * hi;
if(x < 0)x += 0x7FFFFFFFL;
random_seed = x;
return (x % ((unsigned long int)0x7FFFFFFFL + 1));
}
// random algorithm using Fibonacci-LFSR
unsigned int random_LFSR(void)
{
unsigned int shift_bit;
shift_bit = (random_seed & 0x0001) ^
((random_seed & 0x0004) >> 2) ^
((random_seed & 0x0008) >> 3) ^
((random_seed & 0x0020) >> 5);
random_seed = (random_seed >> 1) | (shift_bit << 15);
return random_seed;
}
long random(long max_num)
{
if(max_num ==0) return 0;
return random() % max_num;
}
long random(long min_num, long max_num)
{
if(min_num >= max_num)return 0;
if(max_num == 0) return 0;
return random( max_num - min_num ) + min_num;
}
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