Finished exercise 04-14

ch_04/exercise_04-01/main.c

@@ -15,7 +15,7 @@
 
 int main()
 {
-    char s[] = "this is not the end, but it might as well be.The time is nigh. The end will befall all of us. The end.\0";
+    char s[] = "this is not the end, but it might as well be. The end will befall all of us. The end.\0";
     char t[] = "end\0";
 
     printf("Searching for string: %s\nIn: %s\n", t, s);

ch_04/exercise_04-14/main.c

@@ -0,0 +1,42 @@
+/*
+ *
+ * Exercise 4-14. Define a macro swap(t,x,y) that interchanges two arguments of type t.
+ *
+ * Author: Kun Deng
+ */
+
+#include <stdio.h>
+
+// Macro definition
+#define swap(t, x, y) do \
+{ \
+    t tmp = x; \
+    x = y; \
+    y = tmp; \
+} while(0)
+
+
+void print_pair(const int x, const int y, const char *message)
+{
+    printf("%s: x = %d and y = %d\n", message, x, y);
+}
+
+
+int main()
+{
+    int x_int = 10, y_int = 25;
+
+    print_pair(x_int, y_int, "Before");
+
+    swap(int, x_int, y_int);
+
+    print_pair(x_int, y_int, "After");
+
+    float x_double = 99.99, y_double = 8.55;
+
+    print_pair(x_double, y_double, "Before");
+    swap(float, x_double, y_double);
+    print_pair(x_double, y_double, "After");
+
+    return 0;
+}

ch_04/exercise_04-14/main_template.c

@@ -1,18 +0,0 @@
-/*
- *
- * Exercise 4-14. Define a macro swap(t,x,y) that interchanges two arguments of type t.
- *
- * Author: Kun Deng
- */
-
-
-// Macro definition
-// #define swap(t, x, y)
-
-
-int main()
-{
-
-
-    return 0;
-}