Example struct

#include <stdio.h>
#include <stdlib.h>

int main()
{
    typedef struct Student
    {
      char name[100];
      char birth_date[12];
      float scores[10];
    } Student;

    int student_number;
    printf("Number of students: ");
    scanf("%d", &student_number);

    Student *students = malloc(sizeof(Student) * student_number);
    int i;
    for(i = 0; i < student_number; i++) {
        printf("Student number %d", i);
        printf("Name, Birth date %d", i);
        scanf("%s %s", &students[i].name, &students[i].birth_date);
        printf("Number of exams for the student %s", students[i].name);
        int exam_number;
        scanf("%d", &exam_number);
        int j;
        for(j = 0; j < exam_number; j++) {
            printf("Exam number %d", j);
            scanf("%f", &students[i].scores[j]);
        }
    }

    printf("Printing student average: \n");
    for(i = 0; i < student_number; i++) {
        printf("Student number %d - Name: %s - date of bird: %s ", i, students[i].name, students[i].birth_date);
        float sum = 0;
        int j;
        for(j = 0; j < sizeof(students[i].scores) / sizeof(int); j++) {
            sum += students[i].scores[j];
        }
        printf("Student average: %f", sum);
    }
    return 0;
}