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a guest Dec 10th, 2018 53 Never
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  1. #include <iostream>
  2. #include <iomanip>
  3. #include <fstream>
  4. #include <string>
  5. using namespace std;
  6. int main()
  7. {
  8.     ifstream filein;
  9.     filein.open("a.txt");
  10.     if (!filein)
  11.     {
  12.         cout << "Nieudana proba otwarcia pliku!" << endl;
  13.         system("pause");
  14.         return 1;
  15.     }
  16.     double d,temp[100] = { 0 };
  17.     int ilosc = 0;
  18.     while (ilosc < 100)
  19.     {
  20.         filein >> d;
  21.         if (filein.eof())break;
  22.         temp[ilosc] = d;
  23.         cout << d << endl;
  24.         ilosc++;
  25.     }
  26.     filein.close();
  27.     ofstream fileout("a.txt");
  28.     if (!fileout)
  29.     {
  30.         cout << "Nieudana proba otwarcia pliku!" << endl;
  31.         system("pause");
  32.         return 1;
  33.     }
  34.     for (int i = 0;i < ilosc;i++)
  35.     {
  36.         fileout << fixed<<setprecision(1)<<temp[i] << endl;
  37.     }
  38.     fileout.close();
  39.     fileout.open("b.txt",ios::app);
  40.     double suma = 0;
  41.     for (int i = 0;i < ilosc;i++) suma += temp[i];
  42.     double srednia = suma / ilosc;
  43.     fileout << "srednia: " << fixed << setprecision(3) << srednia << endl;
  44.     fileout.close();
  45.     system("pause");
  46.     return 1;
  47. }
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