Exerc 4_14.

chapter_4.functions_progr_structure/4_14.swap_macro/Makefile

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+BINARY=swap_macro
+
+include ../../Makefile.exerc

chapter_4.functions_progr_structure/4_14.swap_macro/main.c

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+# include <stdio.h>
+# include "swap.h"
+
+int main ()
+{
+  char c0 = '0', c1 = '1';
+  int i0 = 10, i1 = 222;
+
+  printf("char: '%c', '%c' => '", c0, c1);
+  swap(char, c0, c1);
+  printf("%c', '%c'\n", c0, c1);
+  printf("int: %d, %d => ", i0, i1);
+  swap(int, i0, i1);
+  printf("%d, %d\n", i0, i1);
+
+  return 0;
+}

chapter_4.functions_progr_structure/4_14.swap_macro/swap.h

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+# ifndef SWAP_H
+# define SWAP_H
+
+# define swap(T, X, Y) \
+  {                    \
+    T c = X;           \
+    X = Y;             \
+    Y = c;             \
+  };                   \
+
+# endif

chapter_4.functions_progr_structure/4_14.swap_macro/tests/t0.tout

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+char: '0', '1' => '1', '0'
+int: 10, 222 => 222, 10