Column count from data file

Hi all,

I have a dat file called customer.dat with this content:

0 1.1 2 -0.3 4 ...
5 6 7 8 9 ...
10.1 11 12 13 99 ...
...
...

I have no prior idea about number of rows and columns. Below a sample code I have written using fgets. the output gives the number of rows. but I also want to calculate number of columns.

can anybody give me any idea...

Code:

---

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

int main() {
  FILE *dataFile;
  char fileName[100];
  char customer[100];
  int nRow = 0;


  printf("Enter the name of the file: ");
  fgets(fileName, sizeof(fileName), stdin);

  if((dataFile = fopen(fileName, "r")) == NULL) {
        printf("Error Opening File.\n");
        exit(1);
        }
 
  while( fgets(customer, sizeof(customer), dataFile) != NULL ) {
        nRow++;
        printf("Row %d: %s\n",nRow, customer);
        }

  fclose(dataFile);
  return 0;
  }

---

Looks good to me. Dev-cpp is your IDE? I see the weirdly aligned closing brace...

Once you've got a line of data, you can then try to sscanf the line in a loop picking out one number each iteration of the loop and incrementing a counter.

Thanks hk_mp5kpdw. I got my answer. here is the final code. Please tell me if there is any scope of improvements.

Code:

---

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

int main() {
  FILE *dataFile;
  char fileName[100];
  char customer[100];
  int nRow = 0, nCol = 0, n=0;
  char *line;
  char entry[11];

  printf("Enter the name of a ascii file: ");
  fgets(fileName, sizeof(fileName), stdin);



  if((dataFile = fopen(fileName, "r")) == NULL) {
        printf("Error Opening File.\n");
        exit(1);
        }

  while((line = fgets(customer, sizeof(customer), dataFile)) != NULL ) {
        while(sscanf(line, "%10s%n", entry, &n ) == 1 ) {
                nCol++;
                line += n;
                }

        nRow++;
        printf("Column Entries: %d Row %d: %s\n",nCol, nRow, customer);
        nCol = 0;
        }

  fclose(dataFile);
  return 0;
 
}

---

BTW I am using Borland IDE.

it is enough to parse one line to determine number of columns

dataFile = fopen(fileName, "r")
you need to remove '\n' first from the filename

Thanks for your comment. I need to check missed entry in the data file. so i keep counting the columns in each row. Why I need to remove '\n' first from the filename?

Quote:

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Originally Posted by spiit231

Why I need to remove '\n' first from the filename?

---

Otherwise fopen will fail