cout在使用C的while循环后没有显示？

Question

我正在分配作业，以将学生姓名和他们的成绩分配到一个数组中，并找到平均成绩。我似乎无法在while循环后显示任何cout语句。我将头撞在墙上已经有一段时间了，所以任何帮助都会很棒。可能有些明显的东西我正在丢失。

#include <iostream>
#include <fstream>

int main()
{
    using namespace std;

    //Variables
    ifstream inFile;
    ofstream outFile;
    inFile.open("data7.txt");
    outFile.open("Results.txt");
    int quantity = 0;
    int sum = 0;
    int x = 0;
    double avg = 0;
    double grade[MAX];
    double gradeInput;
    string name[MAX];
    string nameInput;

    //Checks if file is found
    if (!inFile)
    {
        cout << "Error finding input file\n";       
    }

    while (!inFile.eof())
    {
        x++;

        getline(inFile, nameInput);
        inFile >> gradeInput;

        name[x] = nameInput;
        grade[x] = gradeInput;
    }

    for (int i = 0; x > i;)
    {
        i++;

        inFile >> sum;
        avg = avg + sum;

        avg = avg / i;  
    }

    cout << "Enter quantity of grades to be processed (0 - , " << x << ", ):";
    cin >> quantity;

Answer 1

我改变了从文件中获取值的方式（从getline（）到operator >>），而不是计算平均值的方式（而且，在计算平均值之前，请问我有多少年级考虑在内），这就是结果：

#include <iostream>
#include <fstream>
using namespace std;
int main() {
    //Variables
    int MAX = 100;
    ifstream inFile;
    ofstream outFile;
    inFile.open("data7.txt");
    outFile.open("Results.txt");
    int quantity = 0;
    int sum = 0;
    int x = 0;
    double avg = 0;
    double grade[MAX];
    double gradeInput;
    string name[MAX];
    string nameInput;

    //Input

    //Calculations

    //Checks if file is found
    if (!inFile) {
        cout << "Error finding input file\n";

    }

    while (inFile >> nameInput) {
        x++;

        inFile>> nameInput;
        inFile >> gradeInput;

        name[x] = nameInput;
        grade[x] = gradeInput;
        cout<<"name: "<<name[x]<<" with a grade: "<<grade[x]<<endl;

    }

    cout << "Enter quantity of grades to be precoessed(0 - , " << x << ", ):";
    cin >> quantity; 

    for (int i = 0; quantity > i; i++) {

        avg = avg + grade[i];

    }
    cout<<endl<<"Avg: "<<avg / quantity<<endl;

}

带有data7.txt，例如：

a 3
b 10
c 20
d 10
e 10

Answer 2

好吧，我发现在while循环中使用inFile.eof（）会以某种方式干扰事物，并且一旦我将代码更改为]，cout语句就可以工作了>]

while (inFile)
    {

        x++;

        getline(inFile, nameInput);
        inFile >> gradeInput;

        name[x] = nameInput;
        grade[x] = gradeInput;

        if(inFile.eof())
        {
            break;
        }
    }