输出程序注释行

输出程序注释行

 

#include < iostream >
#include < fstream >
#include < vector >
#include < string >
#include < stdexcept >
using   namespace  std;

void  read( const   string  name);

void  read( const   string  name)
{
ifstream file;
char  ch;
char   * s = new   char ();
file.open(name.c_str()); // 讲string类型转换为字符串类型
if (file.fail())
{
   throw  invalid_argument(name);
}
while ( ! file.eof())
{
  int  i = 0 ;
 file. get (ch);
  while (ch != ' / ' )
   file. get (ch);
 file. get (ch);
  if (ch != ' * ' )
    continue ;
  else
  file. get (ch);
   while (ch != ' * ' )
  {
  s[i ++ ] = ch;
  file. get (ch);
 }
 file. get (ch);
  if (ch == ' / ' )
  { 
  cout << s << endl;
  cout << flush;
   for ( int  j = 0 ;j < i;j ++ )
    s[j] = ' * ' ;
 }
  else
   continue ;
}
file.close();
 delete s;
}

int  main()
{
const   string  fname = " 1.txt " ;
try {
 read(fname);
} catch ( const  invalid_argument &  e                                                                                                                                                                         ) {
  cerr << " 不能打开该文件 " << fname << endl;
  exit( 1 );
} catch ( int  e) {
   cerr << " 语法错误 " << endl;
   exit( 1 );
}
return   0 ;
}