#include<iostream>
#include<fstream>
#include<sstream>
using namespace std;

int main (void) {
      srand(time(0));
      int n;
      double **a=new double*[n];
      int data;
      cout<<"dose arithmo grammwn:"<<endl;
      cin >>n;
   //create array
      for (int i=0;i<n;i++)
        a[i]=new double[n];
      for(int i=0;i<n;i++) {
         for(int j=0;j<4;j++) {
            a[i][j]=rand()/RAND_MAX*10.00;
         }
      }

      //arxeio
     ofstream fp;
      fp.open("textfile.txt");
      if(!fp.good()) {
         cerr<<"error opening file"<<endl;
         exit(-1);
      }

     if(fp.is_open()) {
          for(int i=0; i<n; i++) {
             for(int j=0;j<4;j++) {
                 a[i][j]=rand()/RAND_MAX*10.00;
                 fp<< a[i][j]<<" :" ;
              }
            fp<< endl;
          }
      }
      fp.close();

     return 0;
}