Forum Post: Trig functions give wildly wrong results

I am using Code Composer Studio 3.1 with DSP TMS320F2812.

my trig functions are giving wild results.  Here are some examples in my code snippet below:

#define PI 3.1415926535897932384626433832795028841971693993751

void InitLookupTable(void)
{

     int j=0;
    double u = 0.0;

    double v = 0.0;

     memset(SineLookup, 0, sizeof(SineLookup));

    v = sin(PI/2);       // 1
    v=  cos(PI);     //  1
    v=cos(0);        // 20800
    v=cos(PI/2);   // -16384
    v=sin(3*PI/2);     //  1

    for(j= 0; j<512; j++)
    {
        u = sin(0.703125*j*PI/180);
        SineLookup[j] = u;
    }

     return;

}

When I try to create a lookup table of sine(x), 0<x<2*PI, I get crazy values all over the place, including

large positive and negative values as above, and also a ton of zero values.

I am on Windows XP, SP 2.  Can anyone tell me what's wrong?