Вопрос по информатике:

Задача на С++, вот код с ошибками
([C++ Error] Unit1.cpp(25): E2141 Declaration syntax error
[C++ Error] Unit1.cpp(44): E2139 Declaration missing ;
[C++ Error] Unit1.cpp(44): E2134 Compound statement missing })

//---------------------------------------------------------------------------
# pragma hdrstop
# include
# include
# include
# include
//---------------------------------------------------------------------------

void vvod(float z[10], int n);
float Sa (float z[10], int n, float x) ;

//---------------------------------------------------------------------------

void main()
{float a[10], b[10], c[10], h, t, sa, sb,sc;
int i, na, nb, nc;
vvod(a,na);vvod(b,nb);vvod(c,nc);
sa=Sa(a,na,h);
sb=Sa(b,nb,h);
if (sa>sb) cout<<"A i B ikvivalentny" ;
else {sc=Sa(c,nc,t);cout<<"srednee arifmet massiva C ="<< sc;}

//---------------------------------------------------------------------------
void vvod ( float z[10], int & n)
{int i; cin>>n;
for (i=0, i<=n-1,i++)
cin>> z[i];}


//---------------------------------------------------------------------------

float Sa (float z[10], int n, float x)
{int i, k; float s;
k=0; s=0;
for (i=0, i<=i-1,i++)
if (pow(z[i],2)>x) {s=s+z[i]; k++;}
if (k>0)s=s/k;
else cout <<"ochibka ";
return s;}


//---------------------------------------------------------------------------