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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