Function length

tests/TestMembers.cpp:9–11

{\r\n\
float x, y, z;\r\n\
void vec3(float xx, float yy, float zz){ x = xx; y = yy; z = zz; }\r\n\
\r\n\
float length(){ return sqrt(x*x+y*y+z*z); }\r\n\
float dot(vec3 ref v){ return x*v.x+y*v.y+z*v.z; }\r\n\
\r\n\
float w;\r\n\