回答: The completed c++ 由 mmax 于 2013-02-05 18:27

#include 
#include 
#include  www.6park.com
using namespace std; www.6park.com
int main()
{
   string line    = "";
   string first   = "";
   string current = "";
   string next    = ""; www.6park.com
   ifstream inputFile("input.txt"); www.6park.com
   // Open and Read File www.6park.com
   if ( inputFile.is_open() )
   {
      while (inputFile.good() )
      {
         getline (inputFile,line); www.6park.com
         if ( line.length() > 0 )
         {
            cout << endl << "The current line from the file is => " << line << endl; www.6park.com
            // For each line, we print out BEFORE or AFTER for each world www.6park.com
            first = ""; www.6park.com
            for ( int i=0; i < line.length(); i=i+1 )
            {
              // Building the first word www.6park.com
              if ( first == "" &&  (int)toupper(line[i]) != 32 )
              {
                current = current + line[i];
              }
              else
              if ( next == "" && (int)toupper(line[i]) == 32 )
              {
                 // Print out the first word
                 first = line[0];
                 cout << current << " COMES FIRST";
              } www.6park.com
              // Building the second word
              if ( first != "" && (int)toupper(line[i]) != 32 )
              {
                 next = next + line[i];
              } www.6park.com
              if ( next != "" && (int)toupper(line[i]) == 32 )
              {
                 if ( (int)toupper(next[0]) > (int)toupper(current[0]) && next != "end" )
                 {
                    cout << endl << next << " AFTER " << current;
                 } www.6park.com
                 if ( (int)toupper(next[0]) < (int)toupper(current[0]) && next != "end" )
                 {
                    cout << endl << next << " BEFORE " << current;
                 } www.6park.com
                 if ( (int)toupper(next[0]) == (int)toupper(current[0]) && next != "end" )
                 {
                    cout << endl << next << " SAME AS " << current;
                 } www.6park.com
                 current = next;
                 next = "";
              } www.6park.com
            } www.6park.com
           if ( current == "end"  || next == "end" )
           {
              first   = "";
              current = "";
              next    = ""; www.6park.com
              cout << endl << endl;
           } www.6park.com
         }
      } www.6park.com
      cout << endl;
      inputFile.close(); www.6park.com
   }
   else
   {
     cout << "Unable to open file";
   } www.6park.com
  return 0; www.6park.com
} www.6park.com
=== www.6park.com
> cp cpp01.cpp cpp01.cc
> g++ cpp01.cc
> ./a.out www.6park.com
The current line from the file is => Alpha Tango Bravo Epsilon Epsilon Delta end
Alpha COMES FIRST
Tango AFTER Alpha
Bravo BEFORE Tango
Epsilon AFTER Bravo
Epsilon SAME AS Epsilon
Delta BEFORE Epsilon www.6park.com

The current line from the file is => Alpha CTango Fravo Epsilon Epsilon Delta end
Alpha COMES FIRST
CTango AFTER Alpha
Fravo AFTER CTango
Epsilon BEFORE Fravo
Epsilon SAME AS Epsilon
Delta BEFORE Epsilon www.6park.com
 www.6park.com