Problems when reading from a file with fscanf

[godblessingme]

Hi,

I'm getting some problems when using fscanf to read a file.

This is a piece of the program code:

#include <stdlib.h>
#include <stdio.h>
int main()
{
//variable declaration
double position[1000][2]={0};
 
FILE *fp;int j;
 
fp=fopen("1.txt","r");
 
 
char array[100];
 
while(!feof(fp))
 
{
 
 
fgets(array,100,fp);
 
//skip the comment lines which begins with '#' 
 
if(strncmp(array,"#",1)!=0)
 
{
//read from data files with fscanf
 
for(j=1;j<30;j++)
 
{
 
 
fscanf(fp,"%lf, %lf, %lf %*[^\n]",&position[j][0],&position[j][1],&position[j][2]);
 
 
}//for(j=0;j<1000;j++)       
 
 
}//if(strncmp(array[i],####,1)!=0)
 
 
}//while(!feof(fp))
 
fclose(fp);
 
//print points out
for(j=1;j<7;j++)
{
printf("Point %d is %lf %lf %lf\n", j,position[j][0],position[j][1],position[j][2]);
 
}//for(j=1;j<7;j++)
}

The 1.txt file looks like this:
#DATA
003360073, 003362061, 240 #AP-B_LIE_PP01-523
003360073, 003351154, 244 #AP-B_LIE_PP01-10
003360073, 003351154, 243 #AP-B_LIE_PP01

The output is the following:
Point 1 003360073 003362061 240 AP-B_LIE_PP01-523003360073
Point 2 003360073 003351154 244 AP-B_LIE_PP01-10
Point 3 003360073 003351154 243 AP-B_LIE_PP01

The problem is that when the word ends with a minus sign followed by 3
digits (see first line) he takes directly the following word: so
instead of AP-B_LIE_PP01-523 I receive AP-B_LIE_PP01-523003360073.

Can someone help me on this one?????

[gpraghuram]

Can you check the regular expression pattern with scanf.
I think that is causing the issue

Raghu

[newb16]

How can code like this

printf("Point %d is %lf %lf %lf\n", j,position[j][0],position[j][1],position[j][2]);
 

print something like this

Point 3 003360073 003351154 243 AP-B_LIE_PP01
 

Where is 'is' after 'Point %d' and how does %lf specifier print ..._LIE_... ?

[Tassos Souris]

Well it seems that you have 2 errors in your code...

1st Error : you miss the first line of the input file
2nd Error : you get some weird string on output

Oh, you also need to #include <string.h> if you haven't already done that..

As far as the 1st error is concerned, examine how your code executes:
--> Read the #DATA... it starts with # so skip the for loop
--> Read 003360073, 003362061, 240 #AP-B_LIE_PP01-523.. it does not start
with # so go into the for loop.. but in the for loop you read AGAIN, thus you miss the previous you read... so input 003360073, 003362061, 240 #AP-B_LIE_PP01-52 goes wasted!!

As for the second error i think that it happens due to a common error and happens during input.. it is very simple actually.. well you store 3 numbers in your array's "columns".. . so why you made it 2???
Change

double position[1000][2];
 

To:

double position[1000][3];
 

One last thing...
In the printf statement you do not need the lf... actually this is undefined behavior..
In fprintf format l goes with d,i, o, u,x,X specifying that it applies to a long int or unsigned long int argument and to n specifying that it applies to a pointer to long int.
To e,E,f,g,G L can be applied that specifies that they apply to long double argument rather than double.
So, you do not need the l at all.

Hope i helped..
Let us now if you fixed the problem