C++ 错误C2679:二进制'&燃气轮机>；：未找到接受类型为'；的右操作数的运算符；等级类型'；

当我尝试将输入分配到“grades”数组时，我很难理解为什么会收到此错误消息。还有一条消息说“IntelliSense:no operator”>>“与这些操作数匹配，操作数类型为：std:：istream>>GradeType”。任何帮助或提示请。先谢谢你

 // This program will input an undetermined number of student names
    // and a number of grades for each student. The number of grades is 
    // given by the user. The grades are stored in an array.
    // Two functions are called for each student. 
    // One function will give the numeric average of their grades.
    // The other function will give a letter grade to that average. 
    // Grades are assigned on a 10 point spread.  
    // 90-100 A   80- 89 B  70-79 C   60-69 D   Below 60 F

    #include <iostream>

    using namespace std;


    const  int MAXGRADE = 25;              // maximum number of grades per student
    const  int MAXCHAR = 30;              // maximum characters used in a name


    typedef char StringType30[MAXCHAR + 1];// character array data type used for names 
                                           // having 30 characters or less.
    typedef  float GradeType[MAXGRADE];    // one dimensional integer array data type

    float findGradeAvg(GradeType, int);    // finds grade average by taking array of 
                                           // grades and number of grades as parameters

    char  findLetterGrade(float);          // finds letter grade from average given 
                                           // to it as a parameter


    int main()

    {
        StringType30 firstname, lastname;  // two arrays of characters defined
        int numOfGrades;                   // holds the number of grades
        GradeType  grades;                 // grades is defined as a one dimensional array 
        float average;                     // holds the average of a student's grade
        char moreinput;                    // determines if there is more input

        // Input the number of grades for each student

        cout << "Please input the number of grades each student will receive." << endl
             << "This number must be a number between 1 and " << MAXGRADE << " inclusive" << endl;

        cin >> numOfGrades;

        while (numOfGrades > MAXGRADE || numOfGrades < 1)
        {
            cout << "Please input the number of grades for each student." << endl
                 << "This number must be a number between 1 and " << MAXGRADE << " inclusive" << endl;

            cin >> numOfGrades;

        }

        // Input names and grades for each student

        cout << "Please input a y if you want to input more students"
             << " any other character will stop the input" << endl;
        cin >> moreinput;

        while ( moreinput == 'y' || moreinput == 'Y')

        {
            cout << "Please input the first name of the student" << endl;
            cin >> firstname;
            cout << endl << "Please input the last name of the student" << endl;
            cin >> lastname;

            for (int count = 0; count < numOfGrades; count++)

            {

                cout << endl << "Please input a grade" << endl;

                cin >> grades;
                    // Fill in the input statement to place grade in the array

            }

            cout << firstname << ' ' << lastname << " has an average of "; 

            cout << findGradeAvg; // Fill in code to get and print average of student to screen
            cout << findLetterGrade;// Fill in call to get and print letter grade of student to screen

            cout << endl << endl << endl;
            cout << "Please input a y if you want to input more students"
                 << " any other character will stop the input" << endl;
            cin >> moreinput;

        }

        return 0;
    }

    //***********************************************************************
    //                              findGradeAvg
    //
    //  task:           This function finds the average of the 
    //                  numbers stored in an array.
    //            
    //  data in:        an array of integer numbers
    //  data returned:  the average of all numbers in the array
    //
    //***********************************************************************

    float findGradeAvg(GradeType array, int numgrades)

    {

        float sum = 0;
        for (int pos = 0; pos < numgrades; pos++)
        {
            sum = sum + array[pos];
        }
        return (sum / numgrades); // Fill in the code for this function


    }

    //***********************************************************************
    //                              findLetterGrade
    //
    //  task:           This function finds the letter grade for the number
    //                  passed to it by the calling function
    //            
    //  data in:        a floating point number
    //  data returned:  the grade (based on a 10 point spread) of the number 
    //                  passed to the function
    //
    //***********************************************************************

    char  findLetterGrade(float numgrade)

    {

        if (numgrade >= 90 && numgrade <= 100)
        {
            return 'A';
        }
        if (numgrade >= 80 && numgrade <= 89)
        {
            return 'B';
        }
        if (numgrade >= 70 && numgrade <= 79)// Fill in the code for this function
        {
            return 'C';
        }
        if (numgrade >= 60 && numgrade <= 69)
        {
            return 'D';
        }
        else
        {
            return 'F';
        }

    }

//此程序将输入不确定数量的学生姓名
//以及每个学生的分数。年级数为
//由用户提供。等级存储在一个数组中。
//为每个学生调用两个函数。
//一个函数将给出他们成绩的数值平均值。
//另一个函数将为该平均值提供字母等级。
//分数以10分的排列分配。
//90-100A 80-89B 70-79C 60-69D低于60华氏度
#包括
使用名称空间std；
常量int MAXGRADE=25；//每个学生的最大分数
常量int MAXCHAR=30；//名称中使用的最大字符数
typedef char StringType30[MAXCHAR+1]；//用于名称的字符数组数据类型
//有30个字符或少于30个字符的。
typedef float GradeType[MAXGRADE]；//一维整数数组数据类型
浮点findGradeAvg（GradeType，int）；//通过获取的数组查找等级平均值
//作为参数的等级和等级数
字符findLetterGrade（float）；//从给定的平均值中查找字母等级
//将其作为一个参数
int main（）
{
StringType30 firstname，lastname；//定义了两个字符数组
int numOfGrades；//保存等级数
GradeType grades；//grades定义为一维数组
浮动平均值；//保存学生成绩的平均值
char moreinput；//确定是否有更多输入
//输入每个学生的分数
cout
grades
是一个数组

所以，使用

cin >> grades[count];

“C++中的数组可能有更多的问题，
数组在很多方面都是特殊的。你的<代码> GradeType < /Cord> Type，掩盖了一个事实，即你有一个数组，从人类，如果不是编译器，这可能会使你的代码很难理解。谢谢。我现在还记得为什么它不起作用。我猜我是在想它。