C ++文件无法正确读取...指针？

Question

文件读取不正确，显示此...

Here is the output

该文件已创建，并且与.cpp文件位于同一目录中，但它无法打开。查看文件扩展名已启用（在Windows资源管理器中），因此不是问题...为什么它无法正确读取？

我想添加＆＃34; ifstream inputFile;＆＃34;在函数范围内会有所帮助，但因为它是全局声明的，所以它不应该是。该文件的拼写完全符合预期，因为我知道它区分大小写。

这只是我的一段代码

完整代码 https://hastebin.com/pomahoyefi.cpp

#include <iostream>
#include <fstream>
#include <cstdlib>
using namespace std;
char getUserChoice();
int calcNumber();
double calcSum();
double calcAvg();
ifstream inputFile;
int main()
{
ifstream inputFile;
char choice;
int num;
double sum;
double average;
do
{
    choice = getUserChoice();
    if (choice == 'a')
    {
        num = calcNumber();
        cout << "Number of scores is " << num << endl;
    }
    if (choice == 'b')
    {
        sum = calcSum();
        cout << "Sum of scores is " << sum << endl;
    }
    if (choice == 'c')
    {
        average = calcAvg();
        cout << "Average of scores is " << average << endl;
    }
}
while(choice == 'a' || choice == 'b' || choice == 'c');
return 0;
}
char getUserChoice()
{
char choice;
do
{
    cout << "Make your choice" << endl;
    cout << "================" << endl;
    cout << "a) Calculate the number of scores in the   le" << endl;
    cout << "b) Calculate the sum of all the scores in the  le" << endl;
    cout << "c) Calculate the average of all scores in the  le" << endl;
    cout << "d) Quit" << endl;
    cin >> choice;
    if (!(choice == 'a' || choice == 'b' || choice =='c' || choice =='d'))
    {
        cout << "Invalid input" << endl;
    }
}
while(!(choice == 'a' || choice == 'b' || choice =='c' || choice =='d'));
return choice;
}
int calcNumber()
{
ifstream inputFile;
double number;
int total = 0;
inputFile.open("studentData.txt");
if(! inputFile)
{
    exit(0);
}
else
{
    while (inputFile >> number)
    {
        ++total;
    }
    inputFile.close();
}
return total;
}