static PyObject *web_heron(PyObject *self, PyObject *args)
{
double a, b,c;
/* Parse the input tuple */
if (!PyArg_ParseTuple(args, "ddd", &a, &b, &c))
return NULL;
/* Call the external C function to compute the area. */
double area = heron(a,b,c);
/* Build the output tuple */
PyObject *ret = Py_BuildValue("d",area);
return ret;
}
double area(const Shape& shape)
{
loc x,y,z;
double r,s;
if (mch::C<Circle>(_,r)(shape))
return 3.14 * r * r;
if (mch::C<Square>(_,s)(shape))
return s * s;
if (mch::C<Triangle>(x,y,z)(shape))
return heron(x,y,z);
XTL_ASSERT(!"Inexhaustive search");
return 0.0;
}
double area(const Shape& shape)
{
mch::wildcard _; // Meta variable
mch::var<loc> x,y,z;
mch::var<double> r,s;
if (mch::C<Circle>(_,r)(shape))
return 3.14 * r * r;
if (mch::C<Square>(_,s)(shape))
return s * s;
if (mch::C<Triangle>(x,y,z)(shape))
return heron(x,y,z);
XTL_ASSERT(!"Inexhaustive search");
XTL_UNREACHABLE; // To avoid warning that control may reach end of a non-void function
}
int main(){
float x, y;
int i, n;
double S;
n = 0;
while(scanf("%f,%f", &x, &y)==2){
V[n].fX = x;
V[n].fY = y;
n++;
}
S = 0.0;
for(i=1; i<n-1;i++){
S += heron(
distance(V[0], V[i]),
distance(V[0], V[i+1]),
distance(V[i], V[i+1]));
}
printf("%f\n",S);
return 0;
}
virtual void visit(const Triangle& s) { result = heron(s.first,s.second,s.third); }