From f65d195593c76b98e666f66013746535ffbb63d6 Mon Sep 17 00:00:00 2001
From: p68710245 <xxj.rcls@seu.edu.cn>
Date: Sun, 28 Apr 2024 19:59:11 +0800
Subject: [PATCH] Add copy_file_with_lines

---
 copy_file_with_lines | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 copy_file_with_lines

diff --git a/copy_file_with_lines b/copy_file_with_lines
new file mode 100644
index 0000000..bddc6e5
--- /dev/null
+++ b/copy_file_with_lines
@@ -0,0 +1,29 @@
+#include <iostream>
+#include <fstream>
+#include <string>
+int main()
+{
+    std::ifstream ifile("hello.txt");
+    std::ofstream ofile("hello_copy.txt");
+    char temp[81];
+    // 忽略文件对象判断的过程
+    do
+    {
+        ifile.getline(temp, 81);
+        if (ifile.rdstate() == std::ios::goodbit) // 正常结束
+            ofile << temp << '\n';
+        else if (ifile.rdstate() == std::ios::failbit) // 读取长度超限，进入fail状态
+        {
+            ifile.clear(); // 恢复流状态
+            ofile << temp; // 注意没有换行
+        }
+        else // 文件读取结束，进入fail+eof状态
+        {
+            ofile << temp;
+            break;
+        }
+    } while (1);
+    ifile.close(); // 如没有这两个函数析构函数也可关闭，但建议显式书写
+    ofile.close();
+    return 0;
+}