編輯：C++上的輸入和輸出文件

Question

因此，由於某些原因，當我從某個文本文件中讀取數據時，我只能讀取並輸出第一個和第三個文件。我不確定它爲什麼不讀它，不管第二個人是否有負數。這裏是我使用的文本文件：

編輯：修正了閱讀的問題，但現在我想讓它認識到，如果它讀取一個空文件，它會識別它是空的，不會終止但給出一個消息，如「文件是空的」。

約瑟夫Kradin III

喬啵

南西亞當斯

這裏是的一部分我代碼在哪裏我的循環和鰭的東西都在那裏：

fin >> firstName; 
     getline(fin, lastName); 
     fin >> deposit >> year >> numCompound; 

    do 
    { 

     fullName = firstName + " " + lastName; 

     // if statements to determine the interest rate depending on the years 

     if (year >= 5) 
      rate = 0.045; 
     else if ((year < 5) & (year >= 4)) 
      rate = 0.04; 
     else if ((year < 4) & (year >= 3)) 
      rate = 0.035; 
     else if ((year < 3) & (year >= 2)) 
      rate = 0.025; 
     else if ((year < 2) & (year >= 1)) 
      rate = 0.02; 
     else 
      rate = 0.015; 

     if (deposit < 0 || year < 0 || numCompound < 0) 
     { 
      cout << fullName << " You have entered a negative number" << endl; 
      fout << fullName << " You have entered a negative number" << endl; 

     } 

     else if (deposit > 0 || year > 0 || numCompound > 0) 
     { 
      numname++; 

      // finding the value for amount of money aquired after n years, including interest. 
      moneyAquired = deposit * pow((1 + rate/numCompound), numCompound*year); 

      // finding earned interest 

      earnedInterest = moneyAquired - deposit; 

      // For the Total Deposit entered 

      totaldeposit += deposit; 

      // For total earned interest 

      totalinterest += earnedInterest; 

      cout << fixed << setprecision(2) << showpoint << setw(20) << left << fullName << setw(15) << year << setw(14) << rate * 100 << "$" << setw(15) << deposit << "$" << setw(15) << earnedInterest << "$" << setw(20) << moneyAquired << endl; 

      fout << fixed << setprecision(2) << showpoint << setw(20) << left << fullName << setw(15) << year << setw(14) << rate * 100 << "$" << setw(15) << deposit << "$" << setw(15) << earnedInterest << "$" << setw(20) << moneyAquired << endl; 

     } 

    } while (fin >> firstName >> lastName >> deposit >> year >> numCompound && !fin.eof()); 

    //end of do while loop 
    fout.close(); 
    fin.close(); 

Answer 1

移動

while (fin >> firstName >> lastName >> deposit >> year >> numCompound && !fin.eof()) 

的開始，而不是做和刪除

fin >> firstName; 
getline(fin, lastName); 
fin >> deposit >> year >> numCompound;