#include <stdio.h>

#define MAX_STUDENTS 100
#define MAX_NAME 69

int readPositiveInt(void);
void readStudentsData(int numbers[], char names[MAX_STUDENTS][MAX_NAME], int line);
void printStudentsData(int numbers[], char names[MAX_STUDENTS][MAX_NAME], int line);

int main(void)
{
    int numbers[MAX_STUDENTS];
    char names[MAX_STUDENTS][MAX_NAME];
    int grades[MAX_STUDENTS];
    int num_students = 0, i = 0;

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

    for(i = 0; i < num_students; i++)
    {
        readStudentsData(numbers, names, i);
    }

    for(i = 0; i < num_students; i++)
    {
        printStudentsData(numbers, names, i);
    }

    printf("\nNumber of students: %d\n", num_students);

    return 0;
}

int readPositiveInt(void)
{
    int n, r;

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

    return n;
}

void readStudentsData(int numbers[], char names[MAX_STUDENTS][MAX_NAME], int line)
{
    printf("\nInsert student number: ");
    numbers[line] = readPositiveInt();

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

void printStudentsData(int numbers[], char names[MAX_STUDENTS][MAX_NAME], int line)
{
    printf("\nStudent number: %d", numbers[line]);

    printf("\nStudent name: %s", names[line]);
}