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Q4.c

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+#include <stdio.h>
+//Question 4
+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() {
+    int num_students, num_subjects;
+    printf("Enter number of students: ");
+    scanf("%d", &num_students);
+    printf("Enter number of subjects: ");
+    scanf("%d", &num_subjects);
+
+    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");
+    }
+
+    double average_grades[num_students];
+    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]);
+    }
+
+    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;
+}