#include <stdio.h>
#include <math.h>
#define NUM_STU 5 /* 5 students in the class */


/* Two arrays, one for student id, and one for 
   student grade */

int student_id[NUM_STU] = {123, 223, 326, 117, 326};
int student_gr[NUM_STU] = {84, 74, 90, 100, 70};



int main() {

	int i, hi, lo, sum;
	double avg;

	hi = student_gr[0];
	lo = student_gr[0];
	sum = 0;


    /* Let's print the grades to the screen */

	printf("id\tgrade\n");

	for (i = 0; i < NUM_STU; i++) {

		printf("%d\t%d\n",student_id[i], student_gr[i]);

		if(hi < student_gr[i])
		    hi = student_gr[i];

	    if(lo > student_gr[i])
		    lo = student_gr[i];

	    sum += student_gr[i];

	}

	printf("\nThe highest grade: %d", hi);
	printf("\nThe lowest grade: %d", lo);

    printf("\nThe sum of the grades: %d", sum);

	avg = sum / NUM_STU;

	printf("\nThe average grade: %f\n\n", avg);


	return 0;

}