[SOLVED] comma separated values

piobair · 01-29-2020, 10:34 PM

I have a data stream, e.g.

Code:

1, 3, 5.89, 7, 15.4

i.e. integer, integer, float, integer, float, separated by commas.
I have tried

Code:

int i0, i1, i2;
float f0, f1;
char c;
fscanf(fp, "%d [^,] %d [^,] %f [^,] %d [^,] %f", &i0, &i1, &f0, &i2, &f1);
// and also
fscanf(fp, "%d %c %d %c %f %c %d %c %f", &i0, &c, &i1, &c, &f0, &c, &i2, &c, &f1);

and every variation that I could think of without success.
There's gotta be a simple answer.

rigor · 01-30-2020, 12:54 AM

Hi piobair!

I'm expecting that you are working with the C language. I created a file scan_em.c containing some changes to your code:

Code:

# include <stdio.h>


/*  scan_em.c  */

int main(  int argc ,  char *argv[]  )
{
    int     i0 ,  i1 ,  i2 ;
    float   f0 ,  f1 ;
    char    c[100] ;
    int     result ;


    result = fscanf(  stdin , "%d, %d, %f, %d, %f" ,  &i0 ,  &i1 ,  &f0 ,  &i2 , &f1 ) ;
    printf(  "First result=%d\n" ,  result  ) ;

    result = fscanf(  stdin , "%d%[, ]%d%[, ]%f%[, ]%d%[, ]%f",  &i0 ,  c ,  &i1 ,  c ,  &f0 ,  c ,  &i2 ,  c ,  &f1  ) ;
    printf(  "Second result=%d\n" ,  result  ) ;
    
    printf(  "f1=%f\n" ,  f1  ) ;
    
    printf(  "c=`%s`\n" ,  c  ) ;
}

Created a file data.txt:

Code:

1, 3, 5.89, 7, 15.4
1, 3, 5.89, 7, 15.4

compiled scan_em.c ran it with data.txt as stdin, and got this output:

Code:

First result=5
Second result=9
f1=15.400000
c=`, `

Hope this helps.

piobair · 01-30-2020, 07:24 AM

Ah! the %[, ] does the trick.
I was leaving out the %.
thank you.

piobair · 01-30-2020, 08:40 AM

I replied before I tested.
// scantest.c

Code:

// gcc scantest.c -lm

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

void main(){
  char bufr[] = {"1, 3, 5.89, 7, 15.4"};
  int i0, i1, i2;
  float f0, f1;

  printf("bufr = %s\n", bufr);
  sscanf(bufr, "%d%[,]%d%[,]%f%[,]%d%[,]%f", &i0, &i1, &f0, &i2, &f1);
  printf("i0=%d, i1=%d, f0=%f, i2=%d, f1=%f\n", i0, i1, f0, i2, f1);
}

results in a segmentation error

piobair · 01-30-2020, 09:06 AM

Fixed. The %[,] needs to be saved to a &c

dugan · 01-30-2020, 09:25 AM

You could use strtok.