Thread: Scanning and Displaying Data File

Hey guys,

I'm trying to scan 3 columns of data from a .txt file. One of the columns does not contain some data. Below is an example of the .txt file.

Code:

1	5	
2	6	
3	7	
4	7	
5	8	2
6	9	5
7	0	6
8	2	27
9	1	8
10	5	9
11	67	0
12	8	1

The problem is when I try to display it in the program, it places a value in those blank cells. For example, the first row is "1 5 blank" but the program will display it as "1 5 2" because it places the "3rd" value in that cell. How can I make it so it skips it?

Here is my code thus far:

Code:

#include <stdio.h>
#include <math.h>
#include <conio.h>
#include <stdlib.h>

int main(void){
                 
     FILE *infile, *outfile;
     float xdata[99], ydata[99], zdata[99];
     int lcv;
     
     infile = fopen("data.txt", "r");
     
     if (infile == NULL){
     printf("unable to open file");
                
     } else {
                       
     for(lcv=0; lcv <=21; ++lcv){
                fscanf(infile, "%f %f %f",&xdata[lcv],&ydata[lcv],&zdata[lcv]); //read
                printf("%10.0f %10.2f %10.2f\n",xdata[lcv],ydata[lcv],zdata[lcv]);                
                }
                fclose(infile);
}        
}

Originally Posted by tabstop

Use fgets to read in one line, and then use sscanf to read out of that line.

And the return value from sscanf() to know how many values you actually got.

--
Mats