#include <stdio.h>

#define MAX_STUDENTS 100
#define MAX_NAME 50

int readPositiveInt();
void readStudentData(int numbers[MAX_STUDENTS],
                     char names[MAX_STUDENTS][MAX_NAME],
                     int line);
void readStudentData2(int *number,
                     char name[MAX_NAME]);
void printStudentData(int numbers[MAX_STUDENTS],
                      char names[MAX_STUDENTS][MAX_NAME],
                      int grades[MAX_STUDENTS],
                      int line);
void printStudentsData(int numbers[MAX_STUDENTS],
                       char names[MAX_STUDENTS][MAX_NAME],
                       int grades[MAX_STUDENTS],
                       int num_students);
void readStudentsGrades(int numbers[MAX_STUDENTS],
                        int grades[MAX_STUDENTS],
                        int num_students);

int main (void){
    int numbers[MAX_STUDENTS];
    char names[MAX_STUDENTS][MAX_NAME];
    int grades[MAX_STUDENTS];
    int num_students, i;

    printf("Insert number of students: ");
    num_students = readPositiveInt();

    //printf("\n\n");
    //for(i = 0; i < num_students; i++){
    //    readStudentData(numbers, names, i);
    //}

    printf("\n\n");
    for(i = 0; i < num_students; i++){
        readStudentData2(&numbers[i], names[i]);
    }

    readStudentsGrades(numbers, grades, num_students);

    printStudentsData(numbers, names, grades, num_students);

    return 0;
}

int readPositiveInt()
{
    int n, r;

    do
    {
        r = scanf("%d", &n);
        while(getchar() != '\n');
    }
    while(r != 1 || n <= 0);

    return n;
}

void readStudentData(int numbers[MAX_STUDENTS],
                     char names[MAX_STUDENTS][MAX_NAME],
                     int line){

    printf("Insert student number: ");
    numbers[line] = readPositiveInt();

    printf("Insert student name: ");
    scanf("%s", names[line]);
}

void readStudentData2(int *number,
                     char name[MAX_NAME]){

    printf("Insert student number: ");
    (*number) = readPositiveInt();

    printf("Insert student name: ");
    scanf("%s", name);
}

void printStudentData(int numbers[MAX_STUDENTS],
                      char names[MAX_STUDENTS][MAX_NAME],
                      int grades[MAX_STUDENTS],
                      int line){
    printf("Student number: %d\n", numbers[line]);
    printf("Student name: %s\n", names[line]);
    printf("Student grade: %d\n\n", grades[line]);
}

void printStudentsData(int numbers[MAX_STUDENTS],
                      char names[MAX_STUDENTS][MAX_NAME],
                      int grades[MAX_STUDENTS],
                      int num_students){
    int i;
    printf("\n\n");
    for(i = 0; i < num_students; i++){
        printStudentData(numbers, names, grades, i);
    }
}

void readStudentsGrades(int numbers[MAX_STUDENTS],
                        int grades[MAX_STUDENTS],
                        int num_students){
    int i;
    printf("\n\n");
    for(i = 0; i < num_students; i++){
        printf("Insert grade of student n%c %d: ", 248, numbers[i]);
        grades[i] = readPositiveInt();
    }
}