学生数据库的插入排序

Question

我目前正在尝试对我的“grades.csv”文件（excel）使用插入排序。我将grades.csv放入一个名为char line []的字符串数组中。文件内包含：StudentID，Exam1，Exam2，Exam3和Grade。我将studentID和成绩放入两个字符串数组中。

该程序只需要对studentID进行排序。但是，无论何时移动studentID，该studentID的等级也会被移动，因此在插入排序中具有成绩字符串。如果排序成功，程序应打印索引，studentID和成绩。

我成功地从文件中读取数据并将其打印出来，但是，我的插入排序似乎无法正常工作，因为在调用时没有打印出来：

//Declaration:
void insertionSort(char listID[],
                   char grades[],
                     int length);
//call
int main(void)
{
FILE* f = fopen("grades.csv", "r");
if (f == NULL) {
        fprintf(stderr, "Error opening file test.dat.");
        exit(1);
}
///////
char line[70];
int size = strlen(line);
char studentID[7];
char grade[2];
char exam1[3];
char exam2[3];
char exam3[3];
int num;

printf("\t+---------+-------+-------+-------+------+\n");
printf("\t| Student | Exam1 | Exam2 | Exam3 | Grade|\n");
printf("\t+---------+-------+------+-------+-------+\n");


while (fgets(line, sizeof(line), f) != NULL){
        sscanf(line,  
                "%25[0123456789], %6[0123456789], %2[^,], %2[^,],%2[^,],%[ ABCD]",
                studentID, exam1, exam2, exam3, grade);

printf("\t| %s  | %+4s  | %+4s  | %+4s  | %+4s \n ",
studentID, exam1, exam2, exam3, grade);




printf("\t+---------+-------+------+-------+------+\n");

for(int j=0; j<size; j++;)
{
insertionSort(studentID, grade, size-1);


printf( "\t %d |  %s | %s\n", j, studentID, grade);
}

void insertionSort(char listID[], char grades[], int length)
{ 
        int walk;
        char key, key1;
        bool located;
        int current;
   for (current = 1; current <= length; current++)
   {
       located = false;
       key = listID[current];
       key1= grades[current];


       for (walk = current - 1; walk >= 0 && !located;)
       {
        if (key < listID[walk])
        {
           listID[walk+1] = listID[current];
           grades[walk+1] = grades[current];
           walk--;
        }
        else
        located =  true; 
       listID[walk+1] = key;
       grades[walk+1] = key1;
   }
}
}