c - Radius of an Ellipse at a given angle with given length and width -

i writing function in c returns radius of ellipse @ given angle given length , width; writing calculation in c:

unfortunately platform not support math.h there sin , cos functions built in can use.

how write calculation in c , store in int?

i have tried:

int theta = 90; int = 164; int b = 144;  float aa = (((a^2) * ((sin_lookup(deg_to_trigangle(theta)))^2)) +             ((b^2) * ((cos_lookup(deg_to_trigangle(theta)))^2))) /            (trig_max_angle^2);  float result = (a * b) / (my_sqrt(aa)); int value = (int)result; 

easy enough

int getradius(double a, double b, double theta) {      double s = sin(theta),             c = cos(theta);      return (a * b) / sqrt((a*a)*(s*s)+(b*b)*(c*c)) } 

though i'm not sure why want return int. you'll loose lot of precision.

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the ^ operator not way powers. it's bitwise xor. common mistake new (c) programmers make. math.h has function pow() calculating powers, said can't use math.h. these values raised second power, it's pretty easy multiply manually.