// Class activity solution

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

struct _course
{
    int student_id;
    int marks;
    char subject[20];   
    //char *subject;   
};
typedef struct _course course;

int main()
{
    // Task1: Create a pointer variable ptr for the structure course
    course * ptr;

    int i, no_of_records;
    printf("Enter number of records: ");
    scanf("%d", &no_of_records);

    // TODID Task 2: Allocate the memory for no_of_records structures with pointer ptr pointing to the base address.
    ptr = calloc(no_of_records, sizeof(course)); 

    // Iterate through the no_of_records to get information from the user for each record
    for(i = 0; i < no_of_records; ++i) {
        printf("Enter the student id,name of the subject and marks respectively:\n");
        
        //TODID Task 3: Get the info id, name of the subject followed by the student mark
	/*course tempcourse;
	scanf("%d %s %d", &tempcourse.student_id, tempcourse.subject, &tempcourse.marks );
	ptr[i].student_id = tempcourse.student_id;
	ptr[i].marks = tempcourse.marks;
	strcpy(ptr[i].subject, tempcourse.subject);*/
	//scanf("%d %s %d", &ptr[i].student_id, ptr[i].subject, &ptr[i].marks );
	course tempcourse;
	scanf("%d %s %d", &tempcourse.student_id, tempcourse.subject, &tempcourse.marks );
	// ptr[i] = tempcourse; // changing what ptr[] is pointing to BAD
	memcpy(&ptr[i], &tempcourse, sizeof(course)); // Copy into the allocated memory
    }

    // If stuff happened here we would get strange errors

    printf("Displaying Student Information:\n");
    for(i = 0; i < no_of_records ; ++i) {
        printf("Student ID: %d\n",(ptr+i)->student_id);
        printf("%s\t%d\n", (ptr+i)->subject, (ptr+i)->marks);
    }
    free(ptr);
    return 0;
}