move exercises, lecture examples, labs into subfolders

Exercises/C9/ex8.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+
+int main() {
+	int rc, start, end, sum = 0;
+
+	printf("Start: ");
+	rc = scanf("%d", &start);
+	if (rc != 1) {
+		printf("Please enter a real integer\n");
+		return 1;
+	}
+	printf("End: ");
+	rc = scanf("%d", &end);
+	if (rc != 1) {
+		printf("Please enter a real integer\n");
+		return 1;
+	}
+
+	if (start > end) {
+		printf("Please ensure that start value is smaller than end value\n");
+		return 1;
+	}
+
+	for (int i = start; i <= end; i++) {
+		printf("%d\n", i);
+		sum += i;
+	}
+
+	printf("Sum: %d\n", sum);
+
+	return 0;
+}