fourier saw wave function

float return_fsaw(int time, int osc_id)
{
    float time_to_rad = ((float)time/ONESECOND)*(2*M_PI); //where ONESECOND is the number of pixels representing one second. the program draws the wave by looping through incrementing time by 1 to draw the wave form of one second.

    float value=0;
    int i = 0;
    for (i=1; i<=oscArray[osc_id]->fourier; i++)
    {
        value += (pow(-1, i))*((sin(i*oscArray[osc_id]->freq*time_to_rad))/i);

    }

    value = (2/M_PI)*value;
    if (value >1) printf("F.Saw: value exceeded 1. Value = %f, time = %d, time_to_rad = %f\n", value, time, time_to_rad);
    return value;
}