C++primer 10.3.1节练习

练习10.11

 1 #include<iostream>
 2 #include<string>
 3 #include <iostream>
 4 #include <string>
 5 #include <vector>
 6 #include <algorithm>
 7 #include <list>
 8 using namespace std;
 9
10 void elmDups(vector<string> &vec);
11
12 bool isShorter(string str, string str1);
13
14 int main()
15 {
16     vector<string> str;
17     string str1;
18     while (cin >> str1)
19     {
20         str.push_back(str1);
21     }
22     elmDups(str);
23     stable_sort(str.begin(), str.end(), isShorter);
24     for (auto c : str)
25         cout << c << endl;
26     system("pause");
27     return 0;
28 }
29
30 void elmDups(vector<string>& vec)
31 {
32     sort(vec.begin(), vec.end());
33     auto it = unique(vec.begin(), vec.end());
34     vec.erase(it, vec.end());
35 }
36
37 bool isShorter(string str, string str1)
38 {
39     return str < str1 ? true : false;
40 }

练习10.12

 1 #include <iostream>
 2 #include <string>
 3 #include "factmain.h"
 4 #include <fstream>
 5 #include <vector>
 6 #include <algorithm>
 7 using namespace std;
 8
 9 struct Sales_data {
10     friend ostream &print(ostream &os, const Sales_data &item);
11     friend istream &read(istream &is, Sales_data &item);
12 private:
13     string bookNo;
14     unsigned units_sold;
15     double price;
16     double revenue;
17     double avg_price() const;
18 public:
19     Sales_data(const string &s, const unsigned &u, const double &p) : bookNo(s), units_sold(u), price(p) {}
20     Sales_data() : Sales_data("12345", 3, 12) {}
21     Sales_data(string s) : Sales_data(s, 2, 4) {}
22     //Sales_data(const string &s, const unsigned &u) : bookNo(s), units_sold(u) {}
23     Sales_data(istream &is) : Sales_data() { read(is, *this); }
24     string  isbn() const { return bookNo; }
25     unsigned &rUnit() { return units_sold; }
26     double &rPrice() { return price; }
27     double &rRevenue() { return revenue; }
28     Sales_data &combine(const Sales_data&);
29
30 };
31
32 Sales_data add(const Sales_data &lhs, const Sales_data &rhs);
33 ostream &print(ostream &os, const Sales_data &item);
34 istream &read(istream &is, Sales_data &item);
35 bool compareIsbn(Sales_data data1, Sales_data data2);
36
37
38 int main()                                                                            //main函数的部分需要改变
39 {
40     vector<Sales_data> Data;
41     Sales_data data;
42     int i = 10;
43     while (i-- != 0)
44     {
45         read(cin, data);
46         Data.push_back(data);
47     }
48     sort(Data.begin(), Data.end(), compareIsbn);
49     for (auto c : Data)
50     {
51         print(cout, c);
52         cout << endl;
53     }
54
55     system("pause");
56     return 0;
57 }
58
59 Sales_data add(const Sales_data & lhs, const Sales_data & rhs) //非成员函数add
60 {
61     Sales_data sum = lhs;
62     sum.combine(rhs);
63     return sum;
64     // TODO: 在此处插入 return 语句
65 }
66
67 istream & read(istream & is, Sales_data & item)
68 {
69     is >> item.bookNo >> item.units_sold >> item.price;
70     item.revenue = item.units_sold * item.price;
71     return is;
72     // TODO: 在此处插入 return 语句
73 }
74
75 bool compareIsbn(Sales_data data1, Sales_data data2)
76 {
77     return data1.isbn() < data2.isbn() ? true : false;
78 }
79
80 ostream & print(ostream & os, const Sales_data & item)
81 {
82     os << item.bookNo << " " << item.units_sold << " " << item.price << " " << item.revenue;
83     return os;
84     // TODO: 在此处插入 return 语句
85 }
86
87 Sales_data & Sales_data::combine(const Sales_data &rhs)
88 {
89     units_sold += rhs.units_sold;
90     revenue += rhs.revenue;
91     return *this;
92 }
93
94 inline double Sales_data::avg_price() const
95 {
96     return units_sold ? revenue/units_sold : 0;
97 }

练习10.13

 1 #include<iostream>
 2 #include<string>
 3 #include <iostream>
 4 #include <string>
 5 #include <vector>
 6 #include <algorithm>
 7 #include <list>
 8 using namespace std;
 9
10 void elmDups(vector<string> &vec);
11
12 bool isShorter(string str, string str1);
13
14 bool divide(string s);
15
16 int main()
17 {
18     vector<string> words{ "the", "quick", "red", "fox", "jumps", "over","the", "slow","red","turtle" };
19     elmDups(words);
20     auto it = partition(words.begin(), words.end(), divide);
21     for (auto iter = words.begin(); iter != it; ++iter)
22         cout << *iter << endl;
23     system("pause");
24     return 0;
25 }
26
27 void elmDups(vector<string>& vec)
28 {
29     sort(vec.begin(), vec.end());
30     auto it = unique(vec.begin(), vec.end());
31     vec.erase(it, vec.end());
32 }
33
34 bool isShorter(string str, string str1)
35 {
36     return str < str1 ? true : false;
37 }
38
39 bool divide(string s)
40 {
41     return s.size() > 4 ? true : false;
42 }