2주차 식 함수호출 매개변수가 없을때

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.gitignore

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+*
+!main.c

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README.md

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-# Computer Programming and Practice 2025-1
- 컴퓨터 프로그래밍 및 실습 과목의 수업 홈페이지
+# 함수호출식 (매개변수가 없는 함수)
+
+함수를 실행하는 것을 함수를 호출한다고 합니다. 
+함수를 호출하는 것은 값을 쓰거나 더하기를 하는 것처럼 결과로 값을 얻습니다. 
+실행 결과를 얻는 것을 식이라고 하고, 식은 문장의 일부로 쓰입니다. 
+
+`식` `(` `)` 형태로 씁니다. 
+
+`(` 왼쪽의 `식`은 함수를 가리켜야 합니다. 
+
+#### 코드 예시:
+```c
+int main() {
+   return main(); /* 자신을 무한히 호출해서 에러가 발생합니다 */
+}
+```
+
+#### 관련 C89 표준
+3.3.2.2 Function calls
+> Semantics
+>
+> ... expression followed by parentheses () ... is a function call.
+> 
+> ... expression denotes the called function. ...
+>
+> ... Recursive function calls shall be permitted, both directly and indirectly through any chain of other functions.

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main.c

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+/* 매개변수가 없는 함수의 호출식 */ 
+
+/* 문법
+ * 식 ( ) 형태로 함수호출식을 씁니다.
+ * 여기서의 식은 함수를 가리켜야 합니다. 함수 이름 등이 가능합니다.
+ *
+ * 의미
+ * 함수를 실행합니다. 
+ * 함수에서 반환한 값이 식의 결과값이 됩니다. 
+ */
+
+/* five는 int 타입의 값인 5를 반환하는 함수입니다. */
+int five() {
+	return 5;
+}
+
+int main() {
+	/* To Do: five()를 호출한 결과를 반환해보세요 */
+	return five();
+}