4.14

1 files changed, 32 insertions, 0 deletions

diff --git a/4/14.c b/4/14.c
new file mode 100644
index 0000000..f142257
--- /dev/null
+++ b/4/14.c
@@ -0,0 +1,32 @@
+#include <stdio.h>
+
+#define swap(t, x, y)                                                          \
+  {                                                                            \
+    t z = x;                                                                   \
+    x = y;                                                                     \
+    y = z;                                                                     \
+  }
+
+/* Swaps two arguments using a macro */
+int main(int argc, char *argv[]) {
+  int a, b;
+  double x, y;
+  char *s1, *s2;
+
+  a = 1;
+  b = 2;
+  swap(int, a, b);
+  printf("\ta=%d, b=%d\n", a, b);
+
+  x = 3.0;
+  y = 5.5;
+  swap(double, x, y);
+  printf("\tx=%f, y=%f\n", x, y);
+
+  s1 = "hello";
+  s2 = "world";
+  swap(char *, s1, s2);
+  printf("\ts1=%s, s2=%s\n", s1, s2);
+
+  return 0;
+}
\ No newline at end of file