學習C++ - 從文件中讀取數字

Question

快速提要：我可以正確地將數據寫入文件（我已經檢查過.txt文件，它完全按照它的樣子呈現），但我只能讀回最後一個輸入的號碼。所以，如果我輸入的最後一個測驗成績是85，那麼只會讀回來。 （學生號讀回正常。） 謝謝大家！仍然在這裏學習......

while (answer == 1) 
{ 
    cout << "What is the student ID?\n"; 
    cin >> studentNumber; 
    cout << "\n"; 
    cout << "How many quizzes did you take?\n"; 
    cin >> numQuiz; 
    outputFile << "\n"; 
    outputFile << studentNumber << "\n"; 
    outputFile << "Number of quizzes: " << numQuiz << "\t" "Grades: "; 
    for (int quiz = 1; quiz <= numQuiz; quiz++) 

    { 


     cout << "Please enter the score for quiz " << quiz << "\t"; 
     cin >> score; 
     total += score; 
     // cout << "The score is " << score << " .\n"; 
     outputFile << score << "\t"; } 

    // outputFile << total; 
    cout << "Do you have a student's grades to input?\nIf yes, type 1. If no, type 0.\n"; 
    cin >> answer; 
    cin.ignore(); 


} 

outputFile.close(); 
fstream inputFile; 



inputFile.open("grades2.txt"); 
inputFile >> studentNumber; 
cout << studentNumber << "\n"; 

inputFile >> score; 
cout << score << "\n"; 

Answer 1

您正在使用錯誤的操作符來讀取數據。取而代之的

inputFile << studentNumber; 

你需要使用

inputFile >> studentNumber;