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new file mode 100644
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new file mode 100644
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diff --git a/main.c b/main.c
new file mode 100644
index 0000000..e7c3387
--- /dev/null
+++ b/main.c
@@ -0,0 +1,25 @@
+/* 함수 선언 */
+/*
+ 함수 정의가 함수 실행 문장 뒤에 있는 경우,
+ 함수 실행 문장에서 함수를 확인할 수 없습니다.
+ 이런 경우에 함수 선언을 통해 함수의
+ 이름, 입력값 종류, 출력값 종류를 정해놓습니다.
+ 함수 선언은 보통 소스 파일의 가장 앞에서 합니다.
+*/
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+/* To Do: 5를 결과값으로 반환하고, 입력값이 없는 five 함수를 선언하기 */
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+ return five();
+}
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+ 출력값: int
+
+ five()는 5를 결과값으로 반환한다.
+*/
+int five() {
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+}