Convert C++ to C

[hxc210]

Thanks a lot

[ne555]

Please indent your code.

//std::vector<double> r,v; //this should be valarray in the first place
double r[2], v[2];

//double operator*(const vector<double> &v1, const vector<double> &v2);
double dot_product2d(const double *v1, const double *v2);

//member functions
//bool Neutron::step_succeeded()
int Neutron_step_succeeded( Neutron *this ) //prefix all member with this->

// I/O
//FILE* instead of ofstream, f{open,close}
//{f,}printf for output
//scanf for input 

[hxc210]

here is the word I have done so far, but the result is just not right. Can anyone help?

[ne555]

¿why did you remove the opening post?

For the undefined references, you need to link against math.
It would be `-lm' in gcc.

Also

Neutron *neutron;
initNeutron( neutron );

is wrong, `neutron' in uninitialized.
You should

Neutron neutron;
initNeutron( &neutron );