9_8.cpp

c++书籍的源代码

#include<fstream.h>
 int main()
{
 char filename[30],s[80],t[80];
 ifstream file1;
 ofstream file2;
 cout<<"请输入文件名"<<endl;
 cin>>filename;
 file2.open(filename,ios::out); 
 if(file2.fail())
 {
  cerr<<"文件打开失败！"<<endl;
  return(1);
 } 
 cout<<"请输入一个字符串"<<endl;
 cin>>s;
 file2<<s;
 file2.close();
 file1.open(filename,ios::in); 
 if(!file1)
 {
  cerr<<"文件打开失败！"<<endl;
  return(1);
 }
 file1>>t;
 cout<<t<<endl;
 file1.close(); 
 return(0);
}