// mesos oros grammwn kai sthlwn pinaka me diastash nxm
// opou n,m>0
#include <iostream>
#include <cstdlib>

using namespace std;
int main(int argc, char *argv[])
{int n=4, m=3,A[4][3]; 
 int sum=0;
 double mo;
 int i, j, sum_mainD, sum_secondaryD;
   cout<<"Dose pinaka A[4][3] (grammh pros grammh)\n";
   for (i = 0; i < n; i++)     {
      for (j = 0; j < m; j++)
           cin>>A[i][j];
   }   

  // ektypwsh 2D
   cout<<"Pinakas A\n";
   for (i = 0; i < n; i++)  {
      for (j = 0; j < m; j++)
           cout<<A[i][j]<<"\t";
      cout<<"\n";
   }
  // ypologismoi moswn orwn kai ektypwsh
   cout<<"Mesoi oroi grammwn tou A\n";
   for (i = 0; i < n; i++)   {
      sum=0;
      for (j = 0; j < m; j++) sum=sum+A[i][j];
      mo=(double)sum/m;
      cout<<"Mesos oros grammhs "<<i<<" einai "<<mo<<endl;
   }
   cout<<"Mesoi oroi sthlwn tou A\n";
   for (j = 0; j < m; j++)   {
      sum=0;
      for (i = 0; i < n; i++) sum=sum+A[i][j];
      mo=(double)sum/n;
      cout<<"Mesos oros sthlhs "<<j<<" einai "<<mo<<endl;
   }   

 system("PAUSE");
 return 0;
}