move exercises, lecture examples, labs into subfolders

Exercises/C8/ex4.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+int main() {
+	int age;
+
+	printf("Enter your age: ");
+	scanf("%d", &age);
+
+	// c only matches one branch so don't need to specify lower limits of each age range
+	if ( age <= 0 ) {
+		printf("Still a baby\n");
+	} else if ( age <= 12 ) {
+		printf("The junior years\n");
+	} else if ( age < 20 ) {
+		printf("Teenage years\n");
+	} else {
+		printf("Downhill all the way now!\n");
+	}
+
+	return 0;
+}