From 011b7a20e4f331c2ce992220a0982b114c5d3774 Mon Sep 17 00:00:00 2001
From: LEESANGKYEONG <sskk713@ajou.ac.kr>
Date: Thu, 6 Aug 2020 01:49:25 +0900
Subject: [PATCH] today content

---
 three files/README.md | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 three files/README.md

diff --git a/three files/README.md b/three files/README.md
new file mode 100644
index 0000000..c94effa
--- /dev/null
+++ b/three files/README.md	
@@ -0,0 +1,23 @@
+#CPP
+- include file
+    -- ex) #include <stdio.h> or "file.h"
+
+- Conditional Complication
+    -- #if, #ifdef, #ifndef, #elif, #else, #endif
+
+#GCC compile option
+-c: generate .o file
+-g: for debeg
+-O: optimization
+
+#GCC compile - for multiple file
+- ex) func.h, func.c, main.c
+    --compile -gcc main.c func.c
+
+
+###project HW2###
+
+#GCC compile -- by using preprocessor
+- #ifdef, #else, #endif
+    -- func.c에서 int func_name_or_id() 구현 (no using #define PRINT_ID)
+    -- difference between gcc -DPRINT_ID main.c func.c and gcc main.c func.c
\ No newline at end of file
-- 
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