Thread: strange error in inputting numbers from .txt file

Hi,
I don't know if any of you know the answer to a problem i'm having. I'm inputting a file into my program using a for loop, however, everytime the for loop runs, the line of data has the digit of the iteration in front of the numbers inputted.

For example,
original data: 56 85 42
iteration (1): 156 185 142
iteration (3): 356 385 342

Does anyone know how to solve this?

My Hat asks if you have your for-loop counter (i or whatever) in your << or >> lines anywhere?

well, here's some of my code, for example:

Code:

struct RangeRecord
{
	// Data members
	unsigned prn;
	double   time;
	double   position[3];
	double   pseudorange;       // range measurement
	double   pseudorangeStdDev; // range measurement std. dev.

    bool read( istream& input );

};

bool readRanges( const string& filename, vector<RangeRecord>& ranges );

int main(int argc, char* argv[] )
{
    // -- Read ranges into an array -----------------------------------------

    vector<RangeRecord> ranges;
    if( !readRanges( config.inputFileName, ranges ) )
    {
        cerr << "Error!\n  Unable to read ranges!\n\n";
       return EXIT_FAILURE;
    }

//main continues (other functions....)
//end main (main function is fine)
}

// Read a range record from a file
// Returns:
//  true  - input was successful
//  false - input failed
//
// Parameters:
//  input - input file stream that has already been opened

bool RangeRecord::read( istream& input )
{
    input >> prn
          >> time
          >> position[0] >> position[1] >> position[2] 
          >> pseudorange
          >> pseudorangeStdDev;
 

    if( !input )
        return false;

    return true;
}


// Read the configuration from a file
//
// Returns:
//  true  - input was successful
//  false - input failed
//
// Parameters:
//  filename - Path of file containing ranges
//  ranges   - Array of ranges

bool readRanges( const string& filename, vector<RangeRecord>& ranges )

{
int size;

    ifstream input( filename.c_str() );

    if( !input )
        return false;

   input >> size;
   ranges.resize(size); //Changes size of vector to hold records

    for(int i = 0; i < size ; i++)
{
     if(!ranges[i].read(input))
			return false;
}

return true;
}

So you're storing them fine, which means you are inadvertently printing out your array index i when you print them out.

well, i 'cout'ed the values after they were input, and then i discovered that the values had changed
just a simple cout

Code:

 
cout << "prn 1" << ranges[0].prn << endl;

Originally Posted by Salem

Your input code doesn't match your data file.

RangeRecord::read for example expects only numeric data, like
1 2 3 4 5 6 7
Parentheses and words (in your example) will just mess that up.

The entire function RangeRecord::read is correct because it was given in class.
Also, the .txt file only contains numeric data.

Originally Posted by angelica

well, i 'cout'ed the values after they were input, and then i discovered that the values had changed
just a simple cout

Code:

 
cout << "prn 1" << ranges[0].prn << endl;

That's your 1 that you're complaining about, I think. Try putting a space (better, a colon and a space) between the 1 and the closing ".

oh geeeeez. what a stupid mistake. thank-you so much for all your help! I really appreciate it