/* Copyright (C) 1997 Makoto Matsumoto and Takuji Nishimura.       *//* Any feedback is very welcome. For any question, comments,       *//* see http://www.math.keio.ac.jp/matumoto/emt.html or email       *//* matumoto@math.keio.ac.jp                                        *//* Period parameters */  #define N           624#define M           397#define MATRIX_A    0x9908b0df   /* constant vector a */#define UPPER_MASK  0x80000000 /* most significant w-r bits */#define LOWER_MASK  0x7fffffff /* least significant r bits *//* Tempering parameters */   #define TEMPERING_MASK_B 0x9d2c5680#define TEMPERING_MASK_C 0xefc60000#define TEMPERING_SHIFT_U(y)  (y >> 11)#define TEMPERING_SHIFT_S(y)  (y << 7)#define TEMPERING_SHIFT_T(y)  (y << 15)#define TEMPERING_SHIFT_L(y)  (y >> 18)static unsigned long mt[N]; /* the array for the state vector  */static int mti=N+1; /* mti==N+1 means mt[N] is not initialized *//* initializing the array with a NONZERO seed */void sgenrand(unsigned long seed){    /* setting initial seeds to mt[N] using         */    /* the generator Line 25 of Table 1 in          */    /* [KNUTH 1981, The Art of Computer Programming */    /*    Vol. 2 (2nd Ed.), pp102]                  */    mt[0]= seed & 0xffffffff;    for (mti=1; mti<N; mti++)        mt[mti] = (69069 * mt[mti-1]) & 0xffffffff;}float genrand(void){    unsigned long y;    static unsigned long mag01[2]={0x0, MATRIX_A};    if (mti >= N) {        int kk;        if (mti == N+1)   /* if sgenrand() has not been called, */            sgenrand(4357); /* a default initial seed is used   */        for (kk=0;kk<N-M;kk++) {            y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);            mt[kk] = mt[kk+M] ^ (y >> 1) ^ mag01[y & 0x1];        }        for (;kk<N-1;kk++) {            y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);            mt[kk] = mt[kk+(M-N)] ^ (y >> 1) ^ mag01[y & 0x1];        }        y = (mt[N-1]&UPPER_MASK)|(mt[0]&LOWER_MASK);        mt[N-1] = mt[M-1] ^ (y >> 1) ^ mag01[y & 0x1];        mti = 0;    }    y = mt[mti++];    y ^= TEMPERING_SHIFT_U(y);    y ^= TEMPERING_SHIFT_S(y) & TEMPERING_MASK_B;    y ^= TEMPERING_SHIFT_T(y) & TEMPERING_MASK_C;    y ^= TEMPERING_SHIFT_L(y);    return (float)(((float)y)*(1.0f/4294967295.0f));}