C++ kursova zadacha

#include <iostream>
#include <string.h>
#include <iomanip>

using namespace std;
const int N=2;
string fam="Dimitrov";
int sum=0;
struct student
          {
               string name;
            string familyName;
            string facN;
            string group;
    };
    typedef student Tmasstud[N+1];
    Tmasstud masstud;

void instud(student &a)
    {
    cout<<"Name: ";
    cin>>a.name;
    cout<<"Family name: ";
    cin>>a.familyName;
    cout<<"F number: ";
    cin>>a.facN;
    cout<<"Group: ";
    cin>>a.group;
    }

void outstud(student a)
{
    cout<<a.name<<" ";
    cout<<a.familyName<<" ";
    cout<<a.facN<<" ";
    cout<<a.group<<endl;
    }

void input(Tmasstud a, int n)
{
    for(int i=1;i<=n;i++)
    {
        cout<<"Enter data for "<<i<<"student"<<endl;
        instud(a[i]);
    }
}

void antetka()
{cout<<"  Name"<<"   "<<" Family name"<<"   "<<" F number "<<"   "<<" Group"<<endl;}

void output(Tmasstud a, int n)
{
    antetka();
    for(int i=1;i<=n;i++)
        {
            outstud(a[i]);
        }
}
int strcom(student a)
{
  if(a.familyName.compare(fam)==0)
            {
               return 1;
            }
  else
            {
        return 0;
    }
}

void strcompare(Tmasstud a, int n)
{
    for(int i=0;i<n;i++)
    {
        sum+=strcom(a[i]);
    }

    double perc=(sum/N)*100;
    cout<<perc;
}
int main()
{
    input(masstud,N);
    output(masstud,N);
    strcompare(masstud,N);
}