From 0df13cfa930c2b05934660213c024cd808b07d24 Mon Sep 17 00:00:00 2001
From: Nuevo009 <73752701+Nuevo009@users.noreply.github.com>
Date: Tue, 28 Sep 2021 19:16:48 +0800
Subject: [PATCH 1/3] Update 7_9.cpp

---
 ch07/7_9.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ch07/7_9.cpp b/ch07/7_9.cpp
index fe7f275..ce1da48 100644
--- a/ch07/7_9.cpp
+++ b/ch07/7_9.cpp
@@ -52,7 +52,7 @@ int getinfo(student * pstu, int n)
         cout << "fullname: ";
         // detect blank line
         cin.getline(pt->fullname, Slen);
-        if(!pt->fullname)
+        if(!*pt->fullname)
             break;
         cout << "hobby: ";
         cin.getline(pt->hobby, Slen);

From c2cb165729364072236c7ce1a4367064bdd7dd09 Mon Sep 17 00:00:00 2001
From: Nuevo009 <73752701+Nuevo009@users.noreply.github.com>
Date: Sat, 9 Oct 2021 16:56:42 +0800
Subject: [PATCH 2/3] Update randwalk.cpp

---
 ch11/11_1/randwalk.cpp | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/ch11/11_1/randwalk.cpp b/ch11/11_1/randwalk.cpp
index 2e84edd..70b324b 100644
--- a/ch11/11_1/randwalk.cpp
+++ b/ch11/11_1/randwalk.cpp
@@ -20,7 +20,11 @@ int main()
     // write to file
     ofstream fout;
     fout.open("walk.txt");
-
+    if (!fout.is_open()) {
+        cout << "Could not write to file \n";
+        cout << "Program terminating.\n";
+        exit(EXIT_FAILURE);
+    }
     cout << "Enter target distance (q to quit): ";
     while (cin >> target)
     {
@@ -29,29 +33,37 @@ int main()
             break;
 
         // write to file
-        fout << "Target Distance: " << target << ", ";
-        fout << "Step Size: " << dstep << endl;
 
+        fout << "Target Distance: " << target << ", Step Size: " << dstep << endl
+             << steps << ": " << result << endl;
         while (result.magval() < target)
         {
             direction = rand() % 360;
             step.reset(dstep, direction, Vector::POL);
             result = result + step;
-            fout << steps << ": " << result << endl;
             steps++;
+            fout << steps << ": " << result << endl;
         }
         cout << "After " << steps << " steps, the subject "
             "has the following location:\n";
         cout << result << endl;
+        fout <<  "After " << steps
+             << " steps, the subject "
+             "has the following location:\n" << result << endl;
         result.polar_mode();
         cout << " or\n" << result << endl;
         cout << "Average outward distance per step = "
-            << result.magval()/steps << endl;
+             << result.magval()/steps << endl;
+        fout << " or\n"
+             << result << endl
+             << "Average outward distance per step = " << result.magval() / steps
+             << endl;
         steps = 0;
         result.reset(0.0, 0.0);
         cout << "Enter target distance (q to quit): ";
     }
     cout << "Bye!\n";
+    fout.close();
 
     return 0; 
 }

From 1c4ba250dd53bf92540a67a7e678918e764c0d8a Mon Sep 17 00:00:00 2001
From: Nuevo009 <73752701+Nuevo009@users.noreply.github.com>
Date: Sat, 9 Oct 2021 18:29:57 +0800
Subject: [PATCH 3/3] Update README.md

I guess you lost a blankspace.
---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index d9e08a2..3951300 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ C++ Primer Plus 6th answers (by **PytLab**)
 
 C++ Primer Plus(第六版) 编程练习答案(全部本人所写，仅供参考)
 
-###Table of Content
+### Table of Content
 
  - [第三章 处理数据](https://github.com/PytLab/Cpp-Primer-Plus/tree/master/ch03)
  - [第四章 复合类型](https://github.com/PytLab/Cpp-Primer-Plus/tree/master/ch04)