Hi guys how are you , hope you are ok. I have a small problem with my code. briefly my program is about chained sequence numbers which requires a user to enter sequences separated by (-1) in an input file as follow:
123 122 121
-1
45 67 89
-1

in the output file the following will be shown:
the sequence 123 122 121 is chained
the sequence 45 67 89 is not chained

( a sequence is called chained when a number is differs by one digit from the previous number )
As can be seen int input that i have to enter -1 between each sequence... that's ok. But my main problem is that i have to enter -1 also after the last entered sequence otherwise an error will be shown in the compiler. Therefore, how can i fix that problem... i tried too much times but i didn't reach to any thing... i wonder if you could help me guys.
The code is :

#include <iostream>
#include <fstream>

using namespace std;

bool differsByOneDigit ( int , int );
void outputResults ( ostream & , const int * , int , bool );

int main()
{


ifstream input ( "c:\\data.txt" );
ofstream output ( "c:\\out.txt" );

if ( input.fail() || output.fail() )
{
cout <<"input or output file did not open!!! " << endl;
return 1;
}

int first , next ; //32bit int == 2147483647
int sequence [ 10 ];//sequence read
int seqLength = 0; //sequence length
int j;
int temp;
bool match; //matching sequence
int firstSeq;

if ( ! ( input >> temp ) )
{
//until you here otherwise, bad file format will be handled by program termination.
cout << endl << "File has a non-int within";
cout << endl << "Bad file format , terminating program!!! ";
return 1;
}
else if ( temp > 1000000000 )
{
//until you here otherwise, number greater than 1 billion will be handled by program termination
cout << endl << "File has number greater than 1 billion";
cout << endl << "Too large number , terminating program!!! ";
return 1;
}

while ( ! input.eof() )
{

firstSeq = temp;
//read next sequence
while ( temp != -1 && seqLength < 10 && !input.eof() )
{
sequence [ seqLength ++ ] = temp;
if ( ! ( input >> temp ) )
{
//until you here otherwise, bad file format will be handled by program termination.
cout << endl << "File has a non-int within";
cout << endl << "Bad file format , terminating program!!! ";
return 1;
}
else if ( temp > 1000000000 )
{
//until you here otherwise, number greater than 1 billion will be handled by program termination
cout << endl << "File has number greater than 1 billion";
cout << endl << "Too large number , terminating program!!! ";
return 1;
}
}
if ( temp != -1 )
{
//until you here otherwise, bad file format will be handled by program termination.
cout << endl << "File has a sequence length greater than 10!!!";
cout << endl << "Bad file format , terminating program!!! ";
return 1;
}
if ( seqLength <= 1 )
{
cout << endl << "Sequence of one or less found!!";
continue;
}
sequence [ seqLength ] = -1;
j = 0;
first = sequence [ j ];
next = sequence [ j + 1 ];
j += 2;
match = true;
while ( match && next != -1)
{

match = differsByOneDigit( first , next );
first = next;
next = sequence [ j ];
j++;

}
if ( match )
match = differsByOneDigit ( first , firstSeq ); //check front to back
outputResults ( output , sequence , seqLength , match );
if ( ! ( input >> temp ) )
{
if ( !input.eof() )
{
//until you here otherwise, bad file format will be handled by program termination.
cout << endl << "File has a non-int within";
cout << endl << "Bad file format , terminating program!!! ";
return 1;
}
}
else if ( temp > 1000000000 )
{
//until you here otherwise, number greater than 1 billion will be handled by program termination
cout << endl << "File has number greater than 1 billion";
cout << endl << "Too large number , terminating program!!! ";
return 1;
}
seqLength = 0;
}
output.close();
input.close();

return 0;

}
bool differsByOneDigit ( int first , int next )
{

int differentDigits = 0;

while ( first != 0 && next != 0 && differentDigits <= 1 )
{
if ( first % 10 != next % 10 ) //count different digits
differentDigits ++;
first /= 10;
next /= 10;

}
if ( differentDigits > 1 || first || next )
return false;
else
return true;

}
void outputResults ( ostream & output , const int * sequence , int length , bool isChainedSequence )
{

int j = 0;

output << "The sequence : ";

while ( j < length )
{
output << sequence [ j ++ ] << " " ;
if ( j % 7 == 0 )
output << endl;
}
if ( isChainedSequence )
output << endl << "Is a chained sequence " << endl;

else
output << endl << "is a not a chained sequence " << endl;;

output << endl <<"****************************************************" << endl;

}
Regards