up to chapter 7

.gitignore

@@ -1 +1,3 @@
 ex1
+ex3
+ex4

Makefile

@@ -1,11 +1,13 @@
 CFLAGS=-Wall -g
 
+EXERCISES = ex1 ex3 ex4
 
-all: ex1
+
+all: $(EXERCISES)
 
 
 clean:
-	rm -f ex1
+	rm -f $(EXERCISES)
 
 
 .PHONY: all clean

ex3.c

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

ex4.c

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