数组结构无法正确打印

我的数组结构无法正确打印。有人可以帮我吗？该代码似乎有效，但是我不知道它打印阵列结构时发生了什么。看起来Calcavg功能由于某种原因无法正常运行。

代码：

    #include <iostream>
    #include <fstream>
    #include <cctype>
    #include <cstring>
    #include <iomanip>
    using namespace std;
    double calcAvg(double [][6], int);
    double calcLow(double [][6], int);
    double calcHigh(double [][6], int);
    struct studInfo{
        char fname[10];
        char lname[10];
        double low;
        double high;
        double average;
    };
    int main() {

        ifstream input;
        ifstream input2;
        double scores [9][6];
        char firstName[10];
        char lastName[10];
        int count = 0;

        struct studInfo students[9];
        input.open("cis_testGrades.txt");
        while (!input.eof()){
            for(int a = 0; a < 9; a++){
                cout << "Student " << a+1 << ": ";
                for(int b = 0; b < 6; b++){
                    input >> scores[a][b];
                    cout << scores[a][b] << " ";
                }
                cout << " " << endl;
            }
        }
        input.close();
        /*cout << calcAvg(scores, 9) << endl;
        cout << calcHigh(scores, 9) << endl;
        cout << calcLow(scores, 9) << endl;*/
        input2.open("cis_students.txt");
        while (!input2.eof()){
            input2 >> firstName;
            //firstName >> students[count].fname;
            strcpy(students[count].fname, firstName);
            input2 >> lastName;
            //lastName >> students[count].lname;
            strcpy(students[count].lname, lastName);
            students[count].low = calcLow(scores, count);
            students[count].high = calcHigh(scores, count);
            students[count].average = calcAvg(scores, count);
            count++;
        }
        input2.close();
        for(int a = 0; a < 9; a++)
            cout << students[a].fname << " " << students[a].lname << " " << students[a].low << " " << students[a].high << " " << students[a].average << endl;
        return 0;
    }
    double calcAvg(double grades[9][6], int student){
        double average;
        double sum;
        for(int a = 0; a < 6; a++)
            sum += grades[student][a];
        average = sum/6;
        return average;

    }
    double calcHigh (double grades[][6], int student){
        double high = 0;
        for(int a = 0; a < 6; a++) {
            if (grades[student-1][a] >= high)
                high = grades[student-1][a];
        }
        return high;
    }
    double calcLow (double grades[][6], int student){
        double low = 100;
        for(int a = 0; a < 6; a++) {
            if (grades[student-1][a] <= low)
                low = grades[student-1][a];
        }
        return low;
    }

cis_testgrades.txt：

99 86 88 89 85 78 73 74 72 61 62 63 57 58 93 97 81 81 85 79 75 72 73 64 66 69 68 59 54 49 95 92 98 89
87 83 71 70 76 65 60 61 84 82 81 80 77 73 74 78 70 71 72 79

cis_students.txt：

Robert Smallwood
Mary Stevens
Sally Moore
John Perkins
Connor Cousins
William Laws
Renee Rivers
Thomas Carver
Donna Smith

输出：

Student 1: 99 86 88 89 85 78
Student 2: 73 74 72 61 62 63
Student 3: 57 58 93 97 81 81
Student 4: 85 79 75 72 73 64
Student 5: 66 69 68 59 54 49
Student 6: 95 92 98 89 87 83
Student 7: 71 70 76 65 60 61
Student 8: 84 82 81 80 77 73
Student 9: 74 78 70 71 72 79
Robert Smallwood 6.32404e-322 5.96342e+228 9.93903e+227
Mary Stevens 78 99 84
Sally Moore 61 74 90.1667
John Perkins 57 97 90.8333
Connor Cousins 64 85 75
William Laws 49 69 102.167
Renee Rivers 83 98 83.5
Thomas Carver 60 76 92.1667
Donna Smith 73 84 88