#define UP_SCALE(a) ((int)((a) * 1000))
#define PI UP_SCALE(3.1415)
#define PI12 (PI/12)
#define PI6 (PI/6)
#define PI2 (PI/2)
#define SQRT3 (UP_SCALE(1.7320))
int sinTable[91] =
{
    0,   17,  34,  52,  69,  
    87,     104, 121, 139,    156,
    173, 190, 207, 224, 241,
    258, 275, 292, 309, 325,
    342, 358, 374, 390, 406,
    422, 438, 453, 469, 484,
    499, 515, 529, 544, 559,
    573, 587, 601, 615,    629,
    642, 656, 669, 681, 694,
    707, 719, 731, 743, 754,
    766, 777, 788, 798, 809,
    819, 829, 838, 848,    857,
    866, 874, 882, 891,    898,
    906, 913, 920, 927,    933,
    939, 945, 951, 956,    961,
    965, 970, 974, 978,    981,
    984, 987, 990, 992,    994,
    996, 997, 998, 999, 999,
    1000                        
};

inline int sind(int theta)
{
    if(theta < 0)
    {    theta -= (theta / UP_SCALE(360) - 1) * UP_SCALE(360);
    }

    if(theta > UP_SCALE(360))
    {    theta -= (theta / UP_SCALE(360)) * UP_SCALE(360);
    }

    int multiplier = 1;

    if(theta > UP_SCALE(180))
    {   
        multiplier = -1;
theta -= UP_SCALE(180);
    }

    if(theta > UP_SCALE(90))
    {   
        theta = UP_SCALE(180) - theta;
    }

    int fl = floor(theta);

    if(theta == UP_SCALE(90))
    {
        return UP_SCALE(1) * multiplier;
    }

    return linear_interpolation(fl, sinTable[fl / UP_SCALE(1)], fl + UP_SCALE(1), sinTable[fl / UP_SCALE(1) + 1], theta) * multiplier;
}

inline int cosd(int theta)
{
    return sind(UP_SCALE(90) - theta);
}

inline int sin(int rad)
{
    return sind(fix_div(fix_multi(rad, UP_SCALE(180)), PI));
}

inline int cos(int rad)
{
    return cosd(fix_div(fix_multi(rad, UP_SCALE(180)), PI));
}

inline int linear_interpolation(int x1, int y1, int x2, int y2, int x)
{
    return (x - x1) * ((y2 - y1) / (x2 - x1)) + y1;
}

inline int arctg(int x)
{
    int sta = 0;
    int sp = 0;
    int x2;
    int a;

    if(x < 0)
    {
        x = -x;
        sta |= 0x01;
    }

    if(x > 1)
    {
        x = fix_div(UP_SCALE(1), x);
        sta |= 0x02;
    }

    while(x > PI12)
    {
        sp++;
        a = x + SQRT3;
        a = fix_div(UP_SCALE(1), a);
        x = fix_multi(x, SQRT3);
        x -= UP_SCALE(1);
        x = fix_multi(x, a);
    }

    x2 = fix_multi(x, x);
    a = x2 + UP_SCALE(1.4087812);
    a = fix_div(UP_SCALE(0.55913709), a);
    a += UP_SCALE(0.60310579);
    a -= fix_multi(UP_SCALE(0.05160454), x2);
    a = fix_multi(a, x);

    while(sp > 0)
    {
        a += PI6;
        sp--;
    }

    if(sta & 0x02)
    {
        a = PI2 - a;
    }

    if(sta & 0x01)
    {
        a = -a;
    }

    return a;
}

inline int vectorToAngle(int x, int y)
{
    int angle = 0;
    if(!y)
    {    if(x > 0)
            {angle = PI2;}
        else{angle = -PI2;}
    }
    else
        {angle = arctg(fix_div(x, y));}

    if(y < 0)
    {
        angle += PI;
    }

    return -angle;
}

inline int floor(int x)
{
    if(x >= 0)
    {
        return (x / UP_SCALE(1)) * UP_SCALE(1);
    }
    else
    {
        return (x / UP_SCALE(1) - 1) * UP_SCALE(1);
    }
}

inline int ceil(int x)
{
    if(x % UP_SCALE(1) == 0)
    {
        return x;
    }

    return floor(x) + UP_SCALE(1);
}

inline int round(int x)
{
    int multiplier = 1;
    if(x < 0)
    {
        multiplier = -1;
        x = -x;
    }

    if(x % UP_SCALE(1) < UP_SCALE(0.5))
    {
        return floor(x) * multiplier;
    }
    return ceil(x) * multiplier;
}

inline int fix_multi(int p1, int p2)
{
    return p1 * p2 / UP_SCALE(1);
}

inline int fix_div(int p1, int p2)
{
    return p1 * UP_SCALE(1) / p2;
}

inline int abs(int x)
{
    return x >= 0 ? x : -x;
}

inline int sign(int x)
{
    if(x > 0)
    {
        return UP_SCALE(1);
    }
    if(x < 0)
    {
        return UP_SCALE(-1);
    }

    return 0;
}

inline int dotProduct2D(int op1x, int op1y, int op2x, int op2y)
{
    return fix_multi(op1x, op2x) + fix_multi(op1y, op2y);
}

inline unsigned int rnd()
{
    static unsigned int
        x=123456789, y=362436069,
        z=521288629, w=88675123;
    unsigned int t;
    t = x ^ (x << 11);
    x = y; y = z; z = w;
    w = (w ^ (w >> 19)) ^ (t ^ (t >> 8));
    return w;
}

要清楚别人看你的程序主要是先知道它能用到干什么有什么用，而不是慢慢的研究你的程序那么几天才知晓它拿来干啥子，有啥用（除非是上头按排的任务）。。。。
你的程序给人的感觉就是这样吧。