diff --git a/lcthw/.gitignore b/lcthw/.gitignore
index 362c151..6add8a7 100644
--- a/lcthw/.gitignore
+++ b/lcthw/.gitignore
@@ -5,3 +5,4 @@ ex8
 ex9
 ex10
 ex11
+ex12
diff --git a/lcthw/Makefile b/lcthw/Makefile
index 79c01a4..de28cc9 100644
--- a/lcthw/Makefile
+++ b/lcthw/Makefile
@@ -1,7 +1,7 @@
 CFLAGS ?= -Wall -g
 GDBRUN = gdb --batch --ex run --ex bt --ex q --args
-BUILD_TARGETS = ex1 ex3 ex7 ex8 ex9 ex10 ex11
-TEST_TARGETS = ex1 ex3 ex7 ex8 ex9 ex11
+BUILD_TARGETS = ex1 ex3 ex7 ex8 ex9 ex10 ex11 ex12
+TEST_TARGETS = ex1 ex3 ex7 ex8 ex9 ex11 ex12
 
 .PHONY: all
 all: build test
diff --git a/lcthw/ex12.c b/lcthw/ex12.c
new file mode 100644
index 0000000..78e218e
--- /dev/null
+++ b/lcthw/ex12.c
@@ -0,0 +1,32 @@
+#include <stdio.h>
+
+int main(int argc, char *argv[])
+{
+	int areas[] = { 10, 12, 13, 14, 20 };
+	char name[] = "Zed";
+	char full_name[] = {
+		'Z', 'e', 'd',
+		' ', 'A', '.', ' ',
+		'S', 'h', 'a', 'w',
+	};
+
+	// WARNING: On some systems you may have to change the
+	// %ld in this code to a %u since it will use unsigned ints
+	printf("The size of an int: %ld\n", sizeof(int));
+	printf("The size of areas (int[]): %ld\n", sizeof(areas));
+	printf("The number of ints in areas: %ld\n",
+			sizeof(areas) / sizeof(int));
+	printf("The first area is %d, the 2nd %d.\n", areas[0], areas[1]);
+
+	printf("The size of a char: %ld\n", sizeof(char));
+	printf("The size of name (char[]): %ld\n", sizeof(name));
+	printf("The number of chars: %ld\n", sizeof(name) / sizeof(char));
+
+	printf("The size of full_name (char[]): %ld\n", sizeof(full_name));
+	printf("The number of chars: %ld\n",
+			sizeof(full_name) / sizeof(char));
+
+	printf("name=\"%s\" and full_name=\"%s\"\n", name, full_name);
+
+	return 0;
+}