#include <stdio.h>
//Question 4

// Finds average value of array
double find_average(const int arr[], int len) {
	double sum = 0.0;
	for(int i = 0; i < len; i++) {
		sum += arr[i];
	}
	return sum/len;
}

// Returns the INDEX of the highest value in array
int find_index_highest(const double arr[], int len) {
	double highest = arr[0];
	int index_highest = 0;

	for(int i = 0; i < len; i++) {
		if(arr[i] > highest) {
			highest = arr[i];
			index_highest = i;
		}
	}
	return index_highest;
}

int main() {
	// To test the functions
	int num_students, num_subjects;
	printf("Enter number of students: ");
	scanf("%d", &num_students);
	printf("Enter number of subjects: ");
	scanf("%d", &num_subjects);

	// Create matrix of grades and use input to assign its values
	int grade_matrix[num_students][num_subjects];
	for(int i = 0; i < num_students; i++) {
		printf("Enter student %d's grades: ", i+1);
		for(int j = 0; j < num_subjects; j++) {
			scanf("%d", &grade_matrix[i][j]);
		}
		printf("\n");
	}

	// Array to hold average grades of students
	double average_grades[num_students];
	// Print every students average grades
	printf("Average Grades:\n");
	for(int i = 0; i < num_students; i++) {
		average_grades[i] = find_average(grade_matrix[i], num_subjects);
		printf("Student %d: %0.02f\n", i+1, average_grades[i]); // Formatted to two decimal places
	}

	printf("Student with Highest Average: Student %d\n", (find_index_highest(average_grades, num_students) +1));

	printf("Students with average >= 75:\n");
	for(int i = 0; i < num_students; i++) {
		if(average_grades[i] >= 75.0)
			printf("Student %d\n", i+1);
	}

	return 0;
}