1 #include <iostream>
2 using namespace std;
3 #include <fstream>
4 #include <iomanip>
5 void test()
6 {
7 int num;
8 cout << "请输入一个十进制整数：" << endl;
9 cin >> num;
10 //十进制输出
11 cout << "十进制输出为：" << num << endl;
12 //八进制输出
13 cout << "八进制输出为："<<oct << num << endl;
14 //十六进制输出
15 cout << "十六进制输出为：" << hex << num << endl;
16 }
17 int main()
18 {
19 test();
20 return 0;
21 }
1 //11-9
2 #include <iostream>
3 using namespace std;
4 #include <fstream>
5 #include <iomanip>
6 #include <string>
7 void test()
8 {
9 ofstream ofs;
10 ofs.open("test1.txt", ios::out);
11 ofs << "我说我不再拥有" << endl;
12 ofs << "你说你还爱我" << endl;
13 ofs << "我说我说我开不了口" << endl;
14 ofs.close();
15 }
16 void test01()
17 {
18 string buf;
19 int counter = 0;
20 ifstream ifs("test1.txt",ios::in);
21 ofstream ofs("test2.txt",ios::out);
22 if (!ifs.is_open())
23 {
24 cout << "文件打开失败" << endl;
25 return;
26 }
27 while (getline(ifs, buf))
28 {
29 ofs << ++counter << "." << buf << endl;
30 }
31 ifs.close();
32 ofs.close();
33 }
34 int main()
35 {
36 test();
37 test01();
38 return 0;
39 }
1 //11-10
2 #include <iostream>
3 using namespace std;
4 #include <fstream>
5 #include <iomanip>
6 #include <string>
7 void test()
8 {
9 int num = 0;
10 char c;
11 char a ='我';
12 ifstream ifs;
13 ifs.open("test1.txt", ios::in);
14 if (!ifs.is_open())
15 {
16 cout << "文件打开失败" << endl;
17 }
18
19 while ((c = ifs.get()) != EOF)
20 {
21
22 if (a == c)
23 {
24 num++;
25 }
26 }
27 ofstream ofs;
28 ofs.open("test2.txt", ios::out);
29 ofs <<"‘我’的个数为：" << num << endl;
30 ofs.close();
31 ifs.close();
32 }
33 int main()
34 {
35 test();
36 return 0;
37 }
