added ex3.14_3.20

ch03/ex3_14.cpp

@@ -0,0 +1,20 @@
+///
+///@Author  PEZY
+///@Date    Aug. 2014
+///@Brief
+/// read a sequence of ints from cin and
+/// store those values in a vector.
+///
+
+#include <iostream>
+#include <vector>
+
+int main()
+{
+  std::vector<int> vec;
+  int i;
+  while (std::cin >> i)
+    vec.push_back(i);
+
+  return 0;
+}

ch03/ex3_15.cpp

@@ -0,0 +1,21 @@
+///
+///@Author  PEZY
+///@Date    Aug. 2014
+///@Brief
+/// read a sequence of strings from cin and
+/// store those values in a vector.
+///
+
+#include <iostream>
+#include <vector>
+#include <string>
+
+int main()
+{
+  std::vector<std::string> vec;
+  std::string str;
+  while (std::cin >> str)
+    vec.push_back(str);
+
+  return 0;
+}

ch03/ex3_16.cpp

@@ -0,0 +1,86 @@
+///
+///@Author  PEZY
+///@Date    Aug. 2014
+///@Brief 
+/// print the size and contents of the vectors from exercise 3.13.
+/// Check whether your answers to that exercise were correct. 
+/// If not, restudy § 3.3.1 (p. 97) until you understand why you were wrong.
+///
+
+#include <iostream>
+#include <vector>
+#include <string>
+
+using std::vector;
+using std::string;
+using std::cout;
+using std::endl;
+
+int main()
+{
+  vector<int> v1;
+  cout << "{\n \"v1\":{\"size\":\"" << v1.size() << "\",\"value\":[";
+  for (auto i : v1)
+    cout << i << ",";
+  if (!v1.empty()) cout << "\b";
+  cout << "]}" << endl;
+
+  vector<int> v2(10);
+  cout << " \"v2\":{\"size\":\"" << v2.size() << "\",\"value\":[";
+  for (auto i : v2)
+    cout << i << ",";
+  if (!v2.empty()) cout << "\b";
+  cout << "]}" << endl; 
+
+  vector<int> v3(10, 42);
+  cout << " \"v3\":{\"size\":\"" << v3.size() << "\",\"value\":[";
+  for (auto i : v3)
+    cout << i << ",";
+  if (!v3.empty()) cout << "\b";
+  cout << "]}" << endl; 
+
+  vector<int> v4{10};
+  cout << " \"v4\":{\"size\":\"" << v4.size() << "\",\"value\":[";
+  for (auto i : v4)
+    cout << i << ",";
+  if (!v4.empty()) cout << "\b";
+  cout << "]}" << endl;
+
+  vector<int> v5{10, 42};
+  cout << " \"v5\":{\"size\":\"" << v5.size() << "\",\"value\":[";
+  for (auto i : v5)
+    cout << i << ",";
+  if (!v5.empty()) cout << "\b";
+  cout << "]}" << endl;
+
+  vector<string> v6{10};
+  cout << " \"v6\":{\"size\":\"" << v6.size() << "\",\"value\":[";
+  for (auto i : v6)
+    if (i.empty()) cout << "(null)" << ",";
+    else cout << i << ",";
+  if (!v6.empty()) cout << "\b";
+  cout << "]}" << endl;
+
+  vector<string> v7{10, "hi"};
+  cout << " \"v7\":{\"size\":\"" << v7.size() << "\",\"value\":[";
+  for (auto i : v7)
+    if (i.empty()) cout << "(null)" << ",";
+    else cout << i << ",";
+  if (!v7.empty()) cout << "\b";
+  cout << "]}\n}" << endl;
+
+  return 0;
+}
+
+///
+///@Output(JSON-like format)
+///{
+/// "v1":{"size":"0","value":[]}
+/// "v2":{"size":"10","value":[0,0,0,0,0,0,0,0,0,0]}
+/// "v3":{"size":"10","value":[42,42,42,42,42,42,42,42,42,42]}
+/// "v4":{"size":"1","value":[10]}
+/// "v5":{"size":"2","value":[10,42]}
+/// "v6":{"size":"10","value":[(null),(null),(null),(null),(null),(null),(null),(null),(null),(null)]}
+/// "v7":{"size":"10","value":[hi,hi,hi,hi,hi,hi,hi,hi,hi,hi]}
+///}
+///

ch03/ex3_17.cpp

@@ -1,50 +1,48 @@
+///
+///@Author  PEZY
+///@Date    Aug. 2014
+///@Brief
+/// Read a sequence of words from cin and store the values a vector. 
+/// After you’ve read all the words, process the vector and change each word to uppercase. 
+/// Print the transformed elements, eight words to a line.
+///
+
 #include <iostream>
-#include <string>
 #include <vector>
+#include <string>
 
-using namespace std;
-//using std::string;
-
-//using namespace std;
-
+using std::cin;
+using std::cout;
+using std::endl;
+using std::vector;
+using std::string;
 
 int main()
 {
-
-    string str;
-
-    vector<string> vec_str;
-    while(cin>>str)
-    {
-        if(str.compare("e")==0)
-        {
-            break;
-        }
-
-
-        if(str.compare("q")!=0)
-        {
-            vec_str.push_back(str);
-        }
-        else
-        {
-            for (unsigned int i=0; i<vec_str.size();i++)
-            {
-                cout<<vec_str[i]
-                      <<" ";
-
-
-                if(i%7==0 && i>0)
-                {
-                    cout<<"\n";
-                }
-            }
-            cout<<"\nthe size is "
-                    <<vec_str.size()
-                        <<"\n";
-            vec_str.clear();
-        }
-    }
-
-    return 0;
+  vector<string> vec;
+  string word;
+  while (cin >> word)
+    vec.push_back(word);
+
+  for (auto &str : vec)
+    for (auto &c : str)
+      c = toupper(c);    
+
+  for (decltype(vec.size()) i=0; i<vec.size(); ++i)
+  {
+    if (i%8 == 0) cout << endl;
+    cout << vec[i] << " ";
+  }
+  cout << endl;
+
+  return 0;
 }
+
+///
+///@Output
+///pezy is a good programmer you can ask any question to him all the time he is playing the codes
+///^D(EOF)
+///PEZY IS A GOOD PROGRAMMER YOU CAN ASK
+///ANY QUESTION TO HIM ALL THE TIME HE
+///IS PLAYING THE CODES
+///

ch03/ex3_18.cpp

@@ -0,0 +1,10 @@
+#include <vector>
+
+using std::vector;
+
+int main()
+{
+  vector<int> ivec{0};
+  ivec[0] = 42;
+  return 0;
+}

ch03/ex3_19.cpp

@@ -0,0 +1,24 @@
+///
+///@Author  PEZY
+///@Date    Aug. 2014
+///@Brief
+/// List three ways to define a vector and give it ten elements,
+/// each with the value 42.
+/// Indicate whether there is a preferred way to do so and why.
+
+#include <iostream>
+#include <vector>
+using std::vector;
+
+int main()
+{
+  vector<int> ivec1(10, 42);
+  vector<int> ivec2{42, 42, 42, 42, 42, 42, 42, 42, 42, 42};
+  vector<int> ivec3;
+  for (decltype(ivec3.size()) i=0; i != 10; ++i)
+    ivec3.push_back(42);
+
+  std::cout << "The first one more better!" << std::endl; 
+
+  return 0;
+}

ch03/ex3_20.cpp

@@ -0,0 +1,47 @@
+///
+///@Author  PEZY
+///@Date    Aug. 2014
+///@Brief
+/// Read a set of integers into a vector.
+/// Print the sum of each pair of adjacent elements.
+/// Change your program so that it prints the sum of the first and last elements,
+/// followed by the sum of the second and second-to-last, and so on.
+///
+
+#include <iostream>
+#include <vector>
+
+using std::vector;
+using std::cout;
+using std::endl;
+using std::cin;
+
+int main()
+{
+  vector<int> ivec;
+  int i;
+  while (cin >> i)
+    ivec.push_back(i);  
+
+  for(decltype(ivec.size()) i=0; i!=ivec.size()-1; ++i)
+    cout << ivec[i] + ivec[i+1] << " ";
+  cout << endl;
+
+  decltype(ivec.size()) size = ivec.size();
+  if (size%2 != 0) size = size/2 + 1;
+  else size /= 2;
+
+  for(decltype(ivec.size()) i=0; i!=size; ++i)
+    cout << ivec[i] + ivec[ivec.size()-i-1] << " ";
+  cout << endl;  
+
+  return 0;
+}
+
+///
+///@Output
+///1 2 3 4 5 6 7 8 9 10
+///EOF
+///3 5 7 9 11 13 15 17 19
+///11 11 11 11 11
+///

docs/ch03/ex3.12_3.13.md

@@ -1 +1 @@
-##Exercise 3.12>Which, if any, of the following vector definitions are in error?For those that are legal, explain what the definition does.For those that are not legal, explain why they are illegal.- (a) vector<vector<int>> ivec;         // legal(c++11), vectors.- (b) vector<string> svec = ivec;       // illegal, different type.- (c) vector<string> svec(10, "null");  // legal, vector have 10 strings: "null".##Exercise 3.13>How many elements are there in each of the followingvectors? What are the values of the elements?- (a) vector<int> v1;         // size:0,  value:0- (b) vector<int> v2(10);     // size:10, value:0- (c) vector<int> v3(10, 42); // size:10, value:42- (d) vector<int> v4{10};     // size:1,  value:10- (e) vector<int> v5{10, 42}; // size:2,  value:10, 42- (f) vector<string> v6{10};  // size:10, value:""- (g) vector<string> v7{10, "hi"};  // size:10, value: "hi"
+##Exercise 3.12>Which, if any, of the following vector definitions are in error?For those that are legal, explain what the definition does.For those that are not legal, explain why they are illegal.```cppvector<vector<int>> ivec;         // legal(c++11), vectors.vector<string> svec = ivec;       // illegal, different type.vector<string> svec(10, "null");  // legal, vector have 10 strings: "null".```##Exercise 3.13>How many elements are there in each of the followingvectors? What are the values of the elements?```cppvector<int> v1;         // size:0,  no values.vector<int> v2(10);     // size:10, value:0vector<int> v3(10, 42); // size:10, value:42vector<int> v4{10};     // size:1,  value:10vector<int> v5{10, 42}; // size:2,  value:10, 42vector<string> v6{10};  // size:10, value:""vector<string> v7{10, "hi"};  // size:10, value:"hi"```

docs/index.md

@@ -42,6 +42,13 @@ C++ Primer 5th Answer Note
     [3.10](https://github.com/pezy/Cpp-Primer/blob/master/ch03/ex3_10.cpp) |
     [3.11](/Cpp-Primer/ch03/ex3.11)
     - [Exercise 3.12 ~ 3.13](/Cpp-Primer/ch03/ex3.12_3.13)
+    - Exercise [3.14](https://github.com/pezy/Cpp-Primer/blob/master/ch03/ex3_14.cpp) |
+    [3.15](https://github.com/pezy/Cpp-Primer/blob/master/ch03/ex3_15.cpp) |
+    [3.16](https://github.com/pezy/Cpp-Primer/blob/master/ch03/ex3_16.cpp) |
+    [3.17](https://github.com/pezy/Cpp-Primer/blob/master/ch03/ex3_17.cpp) |
+    [3.18](https://github.com/pezy/Cpp-Primer/blob/master/ch03/ex3_18.cpp) |
+    [3.19](https://github.com/pezy/Cpp-Primer/blob/master/ch03/ex3_19.cpp) |
+    [3.20](https://github.com/pezy/Cpp-Primer/blob/master/ch03/ex3_20.cpp)
 
   - Chapter 4. Expressions
   - Chapter 5. Statements