【C++ Primer Plus习题】17.5

大家好,这里是国中之林!
❥前些天发现了一个巨牛的人工智能学习网站，通俗易懂，风趣幽默，忍不住分享一下给大家。点击跳转到网站。有兴趣的可以点点进去看看←

问题:

解答:

#include <iostream>
#include <fstream>
#include <string>
#include <set>
#include <windows.h>
using namespace std;

int main()
{
SetConsoleOutputCP(CP_UTF8);

ifstream fin_mat("mat.txt", ios_base::in);
ifstream fin_pat("pat.txt", ios_base::in);

string guest;
set<string>mat_guest, pat_guest, guest_set;
if (!fin_mat.is_open() || !fin_pat.is_open())
{
cout << "Error open files." << endl;
exit(EXIT_FAILURE);
}
while (getline(fin_mat,guest)&&guest.size()>0)
{
mat_guest.insert(guest);
}
cout << "\nMat's friends are: \n";
for (auto pd = mat_guest.begin(); pd != mat_guest.end(); pd++)
{
cout << *pd << " ";
}
while (getline(fin_pat,guest)&&guest.size()>0)
{
pat_guest.insert(guest);
}
cout << "\nPat's friends are: \n";
for (auto pd = pat_guest.begin(); pd != pat_guest.end(); pd++)
{
cout << *pd << " ";
}
fin_mat.close();
fin_pat.close();

guest_set.insert(mat_guest.begin(), mat_guest.end());
guest_set.insert(pat_guest.begin(), pat_guest.end());

ofstream fout("guest.txt", ios_base::out);
if (!fout.is_open())
{
cout << "Error open file." << endl;
exit(EXIT_FAILURE);
}

for (auto pd = guest_set.begin(); pd != guest_set.end(); pd++)
{
fout << *pd << " ";
}
fout.close();

ifstream fin("guest.txt", ios_base::in);
if (!fin.is_open())
{
cout << "Error open file." << endl;
exit(EXIT_FAILURE);
}
cout << "\nAll Guest list: \n";
while (getline(fin,guest)&&guest.size()>0)
{
cout << guest << " ";
}
cout << endl;
fin.close();

return 0;
}

运行结果:

考查点:

• set容器
• 读写文件

注意:

• 字符问题,文件字符要与控制台字符一样才行,不然会出现乱码.
  

• set容器的特点:
  

2024年9月22日16:13:28

原文地址：https://blog.csdn.net/qq_74047911/article/details/142438641

免责声明：本站文章内容转载自网络资源，如本站内容侵犯了原著者的合法权益，可联系本站删除。更多内容请关注自学内容网（zxcms.com）！