myrand
x = (int)((((double)(myrand()-HALFRAND)) *
((double)(myrand()-HALFRAND))/RANDRAND)
y = (int)((((double)(myrand()-HALFRAND)) *
((double)(myrand()-HALFRAND))/RANDRAND)
y = (int)((((double)(myrand()-HALFRAND)) *
((double)(myrand()-HALFRAND))/RANDRAND)
y = (int)((((double)(myrand()-HALFRAND)) *
((double)(myrand()-HALFRAND))/RANDRAND)
temp2 = (double) myrand();
#define rand_mod(m) ((myrand() / 37) % (m)) /* pick number in 0..m-1 */