read amount of columns per line

I need to read the total amount of columns per line from a file. I have absolutely no clue what to put in the loop. Any help is welcome. Thanks.

Code:

void numofcol (int input)
{
	FILE* spData;
	FILE* spOut;
	
	float line;

	spData = fopen ("lab7a.txt", "r");
	spOut = fopen ("output.txt", "a");

	while ( (fscanf (spData, "%f", &line)) == EOF)
	{
				

	}
	
	return;
}

You can help us help you:

What is a column? In vim and some other editors, a column is one character wide. If that is satifactory, read a line with fgetc and increment a counter.

It's pretty extensible to anything else a column could be: just define how wide it is, read that much, and do some arithmetic.

sorry i wasn't more clear, a column in this case contains floating numbers, separated by about 6 spaces. Thanks for quick reply.

edit: also, each line has a different amount of columns.

So read a line using a fgets function and the parse though the line to get different floating point values in that line, which basically means u are getting the values of each line.


look through the fgets function and sscanf function now

ssharish2005

Ok, been working on this for a few days now... Just to find out that I can't use string functions, only basic read/write from files. Please dont send me running around in circles and give me some examples or something...anything! Thx.

Since when are fgets and sscanf string functions? I hate to break your balls, but fgets and sscanf are "basic read/write from files"-type functions.

Since when are fgets and sscanf string functions?

I don't think it is his own decisn...
I think the tutor wants them to fullfil the assignment using basic i/o functions like fscanf

Please dont send me running around in circles

We don't provide the final answers - only the directions...

try something like

Code:

int insideColumn = 0;
int c;
int counter = 0 ;
for(;;)
{
   read character
   if(end of file) 
      exit loop
   if(end of line)
      exit loop
   if(space)
   {
      if(insideColumn)
         insideColumn = 0;
   }
   else
   {
      if(!insideColumn)
      {
         insideColumn = 1;
         counter ++;
      }
   }
}
print counter

*sigh*... now i'm hella lost.
fgets and sscanf are in the chapter labled "string" in my book. Not only that, that is 4 chapters away from what we are studying right now. The functions we are studying right now are fscanf, fgetc, fprintf, and fputc. I'm pretty sure those are the only functions I can use in my program. Thx for your reply.

Thx Vart. I'm not asking for final answers, just something to base on. I want to learn this stuff
I'll give it a try.

Ok i got it to work, but not quite correct. It reads every character instead of every floating number. It also doesn't read the last line.

Code:

int columns (int input)
{
	FILE* spData;
	FILE* spOut;
	
	int cur, closeOut;
	int col = 0;
	int line = 0;
	char word = 'o';

	if ((spData = fopen ("lab7a.txt", "r")) == NULL)
	{
		printf (ERR2);
		return 1;
	}
	if ((spOut = fopen ("output.txt", "a")) == NULL)
	{
		printf (ERR3);
		return 1;
	}

	while ( (cur = fgetc(spData)) != EOF) 
	{
		if (cur == '\t' || cur == ' ')
		{
			word = 'o';
		}
		else if (cur == '\n')
		{
			word = 'o';
			line++;	
			printf ("line %d has %d column\n", line, col);
			col = 0;
		}
		else 
		{
			if (word = 'i');
			{
				word = 'o';
				col++;
			}
		}	
				
	}
		
		
//	fprintf (spOut, "line %d has %d column\n", line, col);

	closeOut = fclose (spOut);
	fclose (spData);

	return 0;
}

if (word = 'i');
are you sure?

I'm pretty sure that regardless of what state your finite state machine is in, andone, word will always be 'o'. Isn't that bad for your parsing?

> if ( word = 'i' ) ;
and this is an assignment which subsequently does nothing, like vart said. Turn up your compiler warnings.

O! And the ; at the end
it expands in

Code:

word = 'i';
if (word)
{ 
   ;
}
{
   word = 'o';
   col++;
}