diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d163863
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+build/
\ No newline at end of file
diff --git a/Makefile b/Makefile
index e18d787..ddac678 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,7 @@
 CC="/usr/bin/gcc"
 # CC="E:\\impressionyang\\scoop\\apps\\mingw\\12.2.0\\bin\\gcc.exe"
 PROJECT=test
+BUILD_DIR=build
 
 # check operating system type
 ifeq ($(OS), Windows_NT)
@@ -64,7 +65,8 @@ INC_DIRS := $(wordlist 1, $(words $(INC_DIRS)), $(INC_DIRS))
 
 # compile job
 all : 
-	$(CC) $(CFLAGS) $(SOURCES) $(HEADERS) $(INC_DIRS) -o $(PROJECT)
+	mkdir -p $(BUILD_DIR) 
+	$(CC) $(CFLAGS) $(SOURCES) $(HEADERS) $(INC_DIRS) -o $(BUILD_DIR)/$(PROJECT)
 
 # virtual clean job
 .PHONY : clean
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..69f173c
--- /dev/null
+++ b/main.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main(int argc, char const *argv[])
+{
+    printf("hello world!\r\n");
+    return 0;
+}