From 8802b4fa27ce58686027e92e9b32a3952e99afb6 Mon Sep 17 00:00:00 2001
From: "ry.yamafuji" <ry.yamafuji@gmail.com>
Date: Sun, 7 Dec 2025 19:11:11 +0900
Subject: [PATCH] =?UTF-8?q?C=E8=A8=80=E8=AA=9E=E7=92=B0=E5=A2=83=E6=A7=8B?=
 =?UTF-8?q?=E7=AF=89?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 Makefile            |  2 +-
 readme/c.md         |  5 ++++-
 src/c/cp.c          | 34 ++++++++++++++++++++++++++++++++++
 src/{ => c}/hello.c |  0
 4 files changed, 39 insertions(+), 2 deletions(-)
 create mode 100644 src/c/cp.c
 rename src/{ => c}/hello.c (100%)

diff --git a/Makefile b/Makefile
index d148c63..af06e3f 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@ CC = gcc
 CFLAGS = -Wall -Wextra -O2
 
 TARGET = dist/hello
-SRC = src/hello.c
+SRC = src/c/hello.c
 
 $(TARGET): $(SRC)
 	$(CC) $(CFLAGS) $(SRC) -o $(TARGET)
diff --git a/readme/c.md b/readme/c.md
index e560080..33c739b 100644
--- a/readme/c.md
+++ b/readme/c.md
@@ -1 +1,4 @@
-# C言語について
\ No newline at end of file
+# C / C++言語について
+
+* コンパイラ: GCC / G++
+* ビルド管理: Makefile
\ No newline at end of file
diff --git a/src/c/cp.c b/src/c/cp.c
new file mode 100644
index 0000000..d00f136
--- /dev/null
+++ b/src/c/cp.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+
+int main(int argc, char *argv[]) {
+
+    // 引数のチェック 3以外ならエラー
+    if (argc != 3) {
+        fprintf(stderr, "Usage: %s src dest\n", argv[0]);
+        return 1;
+    }
+
+    // ファイルのオープン
+    FILE *src = fopen(argv[1], "rb");
+    FILE *dst = fopen(argv[2], "wb");
+
+    // オープン失敗時のエラーチェック
+    if (!src || !dst) {
+        perror("File open error");
+        return 1;
+    }
+
+    // ファイルのコピー 4096バイトずつ書き込む
+    char buf[4096];
+    size_t n;
+
+    // 読み込みと書き込みのループ
+    while ((n = fread(buf, 1, sizeof(buf), src)) > 0) {
+        fwrite(buf, 1, n, dst);
+    }
+
+    fclose(src);
+    fclose(dst);
+
+    return 0;
+}
diff --git a/src/hello.c b/src/c/hello.c
similarity index 100%
rename from src/hello.c
rename to src/c/hello.c