Much cleanup to better match lesson text

lcthw/.gitignore

@@ -1 +1,2 @@
 ex1
+ex3

lcthw/Makefile

@@ -0,0 +1,10 @@
+CFLAGS ?= -Wall -g
+
+all: ex1 ex3
+
+clean:
+	rm -f ex1 ex3
+
+test:
+	./ex1
+	./ex3

lcthw/ex2/.gitignore

@@ -1 +0,0 @@
-ex1

lcthw/ex2/Makefile

@@ -1,4 +0,0 @@
-CFLAGS=-Wall -g
-
-clean:
-	rm -f ex1

lcthw/ex2/ex1.c

@@ -1,12 +0,0 @@
-#include <stdio.h>
-
-/* This is a comment. */
-int main(int argc, char *argv[])
-{
-	int distance = 100;
-
-	// this is also a comment
-	printf("You are %d miles away.\n", distance);
-
-	return 0;
-}

lcthw/ex3.c

@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+int main(int argc, char *argv[])
+{
+	int age = 10;
+	int height = 72;
+
+	printf("I am %d years old.\n", age);
+	printf("I am %d inches tall.\n", height);
+
+	return 0;
+}