Thread: r/w query

Hi guys

As you may be aware I'm reading in a text file pre writting this out again but with a header added to it.

The input text files can be quite large in size (read this as number of lines) so I need to get this read / write to be as quick as possible. Experimentation has found that using the fstream approach is very slow compared to using the c fscanf approach, so I'm using the fscanf ,ethod

However, as you can see from the following code I'm reading in each part of the input file into 3 variables. How can I read the whole line at once into a single string, thereby saving tiime?

Code:

float x,y,z
fscanf(finput,"%f %f %f",&x,&y,&z);

Is there also a way I can just read in the fist character of a line (I assume I could use fgetc), but how do I then jump to the next line?

Thanks

Use fgets() to read the line.
If you want to process it, then use sscanf(buff,"%f %f %f",&x,&y,&z);
If you just want to look at the first char, then that's in buff[0]

So assuming I just wanted to increment a counter, thereby giving a total num of lines when I reach the eof whats the fastest approach? use fgets or fscanf.

In this situation I'm not worried about using the data, just need to do a read of a line?