Question

快速概要：我可以正确地将数据写入文件中（我已经检查了.txt文件并且它完全按照应有的方式显示）但是我可以读回的是输入的最后一个数字。因此，如果我输入的最后一个测验等级是85，那就是它将回读的所有内容。（studentNumber读回来很好。）谢谢大家！还在这里学习......

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

您使用错误的运算符来读取数据。而不是

template <typename T>
class List;
class bigInt {
public:
    List<int> values;
    bigInt();
    bigInt add(bigInt);
    bigInt mul(bigInt);
    bigInt pow(int);
};

你需要使用

inputFile << studentNumber;

学习c ++ - 从文件中读取数字

1 个答案: