1 #include <iostream>
2 #include <fstream>
3 /* run this program using the console pauser or add your own getch, system("pause") or input loop */
4 using namespace std;
5 void save_to_file()
6 {
7 ofstream outfile("f2.dat");
8 if(!outfile)
9 {
10 cerr<<"open f2.dat error!"<<endl;
11 exit(1);
12 }
13 char c[80];
14 cin.getline(c,80);
15 for(int i=0;c[i]!=0;i++)
16 if(c[i]>=65&&c[i]<=90||c[i]>=97&&c[i]<=122)
17 {
18 outfile.put(c[i]);
19 cout<<c[i];
20 }
21 cout<<endl;
22 outfile.close();
23 }
24
25 void get_from_file()
26 {
27 char ch;
28 ifstream infile("f2.dat",ios::in|ios::nocreate);
29 if(!infile)
30 {
31 cerr<<"open f2.dat error!"<<endl;
32 exit(1);
33 }
34 ofstream outfile("f3.dat");
35 if(!outfile)
36 {
37 cerr<<"open f3.dat error!"<<endl;
38 exit(1);
39 }
40 while(infile.get(ch))
41 {
42 if(ch>=97&&ch<=122)
43 ch=ch-32;
44 outfile.put(ch);
45 cout<<ch;
46 }
47 cout<<endl;
48 infile.close();
49 outfile.close();
50 }
51 int main(int argc, char** argv) {
52 save_to_file();
53 get_from_file();
54 return 0;
55 }
