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-rw-r--r--ch4/4-14_swap-macro.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/ch4/4-14_swap-macro.c b/ch4/4-14_swap-macro.c
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+++ b/ch4/4-14_swap-macro.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+
+/* The C Programming Language: 2nd Edition
+ *
+ * Exercise 4-14: Define a macro swap(t,x,y) that interchanges two arguments
+ * of type t. (Block structure will help.)
+ *
+ * Answer: Macros are read and processed before syntax is, so you can turn
+ * a macro into shorthand code; more shorthand than functions sometimes.
+ *
+ * This macro assumes x and y are of t type. If the types don't match up,
+ * it'll (probably) break.
+ */
+
+#define swap(t, x, y) {\
+ t z;\
+ z = x;\
+ x = y;\
+ y = z;\
+}
+
+int main() {
+ int a = 3;
+ int b = 7;
+
+ printf("a is %d, b is %d\n", a, b);
+ swap(int, a, b);
+ printf("Now swap, and... a is %d and b is %d!\n", a, b);
+ return 0;
+}
ts/test_vgstash_cli.py?h=v0.3b6&id=69373e362637b5e89ee347c9874f5f8c4ec6a294&follow=1'>cli: show msg if game to be deleted is not in DBzlg2-2/+12 2018-10-18README: expand on usage, cover shell quotingzlg1-7/+99 2018-10-18cli: Tell the user when a game lacks noteszlg2-3/+15 2018-10-18Catch when an invalid list filter is passedzlg4-3/+24 2018-10-12cli: Add zero-game import/export messageszlg2-11/+18 2018-10-10Bump to 0.3beta1 for PyPIzlg1-1/+1 2018-10-10Move tests and data to dedicated directoryzlg7-10/+26 2018-10-10cli: Add "export" commandzlg2-5/+54 2018-10-10cli: Add "import" commandzlg5-1/+76 2018-10-09Bump to 0.3alpha6 for PyPIzlg1-1/+1 2018-10-09cli: Add "notes" commandzlg2-4/+74 2018-10-09update_game: ensure notes are also savedzlg1-2/+2 2018-10-09cli: add 'update' commandzlg3-20/+92 2018-10-06cli: Add "delete" commandzlg2-0/+19 2018-10-06Remove ID field from DBzlg3-38/+46 2018-10-06cli: change "Status" heading to "Progress"zlg2-36/+40 2018-09-29Bump to 0.3alpha5 for PyPIzlg1-1/+1 2018-09-29cli: Add pretty printing to 'list' commandzlg3-17/+107 2018-09-08setup.py: Bump to alpha4 for PyPIzlg1-1/+1 2018-09-08cli: add '--raw' option to list commandzlg2-9/+45 2018-09-08Add remaining filters to vgstash packagezlg1-2/+11 2018-09-04Update LICENSE to match setup.pyzlg1-80/+67 2018-09-03Branch off from master with pytest, tox, clickzlg16-778/+779 2018-03-18Flesh out filter types and ownership statuszlg3-82/+144 2018-03-18README.mdown: break line correctlyzlg1-1/+1 2018-03-18add 'playlog' list filterzlg2-2/+9 2018-03-13Update helpers a bitzlg1-2/+9 2018-03-13Make VGSTASH_DB_LOCATION point to a filezlg2-21/+20 2016-11-18Remove settings from helpers.shZe Libertine Gamer1-5/+0 2016-11-15Correct phrasing in README.Ze Libertine Gamer1-4/+4 2016-11-13DerpZe Libertine Gamer1-0/+1 2016-11-03Improve error handling in shell scriptsZe Libertine Gamer4-3/+23 2016-10-24Correct run_again, add recursionZe Libertine Gamer1-0/+4 2016-10-21Add quotes to correct behavior for arglistZe Libertine Gamer1-1/+1 2016-10-14updater.sh: add recursion, error handlingZe Libertine Gamer1-43/+101 2016-10-14Correct pipe-handling behaviorZe Libertine Gamer1-1/+9 2016-10-12Clarify a method to move between platformsZe Libertine Gamer1-2/+5