diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..8d3a3fd
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,2 @@
+[*.c]
+charset = utf-8
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..bc46f2c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*/*
+Computer-Programming-and-Practice-2025-1.vcxproj.user
diff --git a/Project-Function-Calls-No-Parameter.vcxproj.user b/Project-Function-Calls-No-Parameter.vcxproj.user
new file mode 100644
index 0000000..88a5509
--- /dev/null
+++ b/Project-Function-Calls-No-Parameter.vcxproj.user
@@ -0,0 +1,4 @@
+
+
+
+
\ No newline at end of file
diff --git a/Project-Function-Declarations-No-Parameter.vcxproj b/Project-Function-Declarations-No-Parameter.vcxproj
new file mode 100644
index 0000000..f0845b9
--- /dev/null
+++ b/Project-Function-Declarations-No-Parameter.vcxproj
@@ -0,0 +1,51 @@
+
+
+
+
+ Debug
+ x64
+
+
+
+ 17.0
+ Win32Proj
+ {56298b6a-7bcc-4ad5-857c-3ae51b8ca9fa}
+ ProjectFunctionDeclarationsNoParameter
+ 10.0
+
+
+
+ Application
+ true
+ v143
+ Unicode
+
+
+
+
+
+
+
+
+
+
+
+
+ Level3
+ true
+ _DEBUG;_CONSOLE;%(PreprocessorDefinitions)
+ true
+ /utf-8 %(AdditionalOptions)
+
+
+ Console
+ true
+
+
+
+
+
+
+
+
+
diff --git a/Project-Function-Declarations-No-Parameter.vcxproj.filters b/Project-Function-Declarations-No-Parameter.vcxproj.filters
new file mode 100644
index 0000000..15aa408
--- /dev/null
+++ b/Project-Function-Declarations-No-Parameter.vcxproj.filters
@@ -0,0 +1,14 @@
+
+
+
+
+ {4FC737F1-C7A5-4376-A066-2A32D752A2FF}
+ c
+
+
+
+
+ c 소스 파일
+
+
+
diff --git a/Project-Function-Declarations-No-Parameter.vcxproj.user b/Project-Function-Declarations-No-Parameter.vcxproj.user
new file mode 100644
index 0000000..88a5509
--- /dev/null
+++ b/Project-Function-Declarations-No-Parameter.vcxproj.user
@@ -0,0 +1,4 @@
+
+
+
+
\ No newline at end of file
diff --git a/README.md b/README.md
index bb3e4ff..fa9df0b 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,22 @@
-# Computer Programming and Practice 2025-1
- 컴퓨터 프로그래밍 및 실습 과목의 수업 홈페이지
+# 함수선언 (매개변수가 없을 때)
+
+함수 선언은 함수 정의, 전역변수 선언과 더불어 전처리 후의 C 프로그램을 구성합니다.
+함수 선언은 이름이 특정 반환타입의 함수를 가리킨다고 정합니다.
+
+`타입` `이름` `(` `)` `;` 형태로 씁니다.
+
+#### 코드 예시:
+```c
+/* 반환 타입이 void고, 이름이 x인 함수의 선언 */
+void x();
+```
+
+#### 관련 C89 표준
+3.5.4.3 Function declarators (including prototypes)
+> Semantics
+>
+> If, in the declaration "T D1", D1 has the form
+>
+> D( ... )
+>
+> ... then the type specified for ident is " ... function returning T."
diff --git a/Solution-Week2.sln b/Solution-Week2.sln
new file mode 100644
index 0000000..e46df0c
--- /dev/null
+++ b/Solution-Week2.sln
@@ -0,0 +1,22 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.13.35818.85 d17.13
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Project-Function-Declarations-No-Parameter", "Project-Function-Declarations-No-Parameter.vcxproj", "{56298B6A-7BCC-4AD5-857C-3AE51B8CA9FA}"
+EndProject
+Global
+ GlobalSection(SolutionConfigurationPlatforms) = preSolution
+ Debug|x64 = Debug|x64
+ EndGlobalSection
+ GlobalSection(ProjectConfigurationPlatforms) = postSolution
+ {56298B6A-7BCC-4AD5-857C-3AE51B8CA9FA}.Debug|x64.ActiveCfg = Debug|x64
+ {56298B6A-7BCC-4AD5-857C-3AE51B8CA9FA}.Debug|x64.Build.0 = Debug|x64
+ EndGlobalSection
+ GlobalSection(SolutionProperties) = preSolution
+ HideSolutionNode = FALSE
+ EndGlobalSection
+ GlobalSection(ExtensibilityGlobals) = postSolution
+ SolutionGuid = {7548D284-3031-4A53-8359-876BE48586E0}
+ EndGlobalSection
+EndGlobal
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..dffe2a1
--- /dev/null
+++ b/main.c
@@ -0,0 +1,23 @@
+/* 매개변수가 없는 함수의 선언 */
+
+/* 문법
+ * 매개변수가 없는 함수는 타입 이름 ( ) ; 형식으로 선언합니다.
+ *
+ * 의미
+ * 해당 이름이 특정 반환타입의 함수를 뜻한다고 정합니다.
+ */
+
+/* To Do: 반환 타입이 int이고 이름이 five인 함수를 선언해보세요 */
+
+int main() {
+ return five();
+}
+
+/*
+ * 함수 이름: five
+ * 반환 타입: int
+ * five()는 5를 결과값으로 반환한다.
+ */
+int five() {
+ return 5;
+}