cooked 3

10.c

@@ -0,0 +1,84 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define MAX 50
+
+
+void fcfs(int requests[], int n, int head) {
+    int total = 0;
+
+    printf("\n--- FCFS ---\n");
+    printf("Order: %d", head);
+
+    for (int i = 0; i < n; i++) {
+        total += abs(requests[i] - head);
+        head = requests[i];
+        printf(" -> %d", head);
+    }
+
+    printf("\nTotal Head Movement: %d\n", total);
+}
+
+// ── SCAN ──────────────────────────────────────────────────────────────────
+void scan(int requests[], int n, int head, int disk_size) {
+    int total = 0;
+    int req[MAX];
+
+    // copy and sort requests
+    for (int i = 0; i < n; i++) req[i] = requests[i];
+    for (int i = 0; i < n - 1; i++)
+        for (int j = 0; j < n - i - 1; j++)
+            if (req[j] > req[j+1]) { int t = req[j]; req[j] = req[j+1]; req[j+1] = t; }
+
+    // find where head sits in sorted array
+    int pos = 0;
+    while (pos < n && req[pos] < head) pos++;
+
+    printf("\n--- SCAN (moving towards higher tracks first) ---\n");
+    printf("Order: %d", head);
+
+    // go right (higher) first
+    for (int i = pos; i < n; i++) {
+        total += abs(req[i] - head);
+        head = req[i];
+        printf(" -> %d", head);
+    }
+    if (head != disk_size - 1) {
+
+        total += abs((disk_size - 1) - head);
+        head = disk_size - 1;
+
+        printf(" -> %d", head);
+    }
+
+    // go left (lower)
+    for (int i = pos - 1; i >= 0; i--) {
+        total += abs(req[i] - head);
+        head = req[i];
+        printf(" -> %d", head);
+    }
+
+    printf("\nTotal Head Movement: %d\n", total);
+}
+
+// ── MAIN ──────────────────────────────────────────────────────────────────
+int main() {
+    int requests[MAX], n, head, disk_size;
+
+    printf("Enter number of requests: ");
+    scanf("%d", &n);
+    printf("Enter requests: ");
+    for (int i = 0; i < n; i++)
+        scanf("%d", &requests[i]);
+
+    printf("Enter initial head position: ");
+    scanf("%d", &head);
+
+    printf("Enter disk size: ");
+    scanf("%d", &disk_size);
+
+    fcfs(requests, n, head);
+    scan(requests, n, head, disk_size);
+
+    return 0;
+}