Read comma separated values from a text file in C [duplicate]

Question

I am really new to C programming and this is a part of an assignment. I am trying to read a comma separated text file in the format:

 [value1], [value2]

in C and trying to pass them as string and int parameter into a function. I have tried using the sscanf() and even manipulation with fgetc() without much help. The space after the comma is proving to be a problem.

Example:

Please help me out.

Thank you.

Possible duplicate - please see this: stackoverflow.com/q/12911299/1726419 — yossico
– yossico, Commented Oct 18, 2014 at 19:09
In fact, you can't possiby. The csv-format may contain quoted commas in the data fields and isn't a simple thing to program as a beginner. If you wouldn't solve the simplest case only, you could use a good library and the examples therein: sourceforge.net/projects/libcsv — rubber boots
– rubber boots, Commented Oct 18, 2014 at 19:12
@SouradeepSinha why don't you give it another try before asking here? If it's an assignement, you are supposed to learn from it ... — rubber boots
– rubber boots, Commented Oct 18, 2014 at 19:16
This question appears to be off-topic because it is just asks for code, shows not attempt to solve it. — Almo
– Almo, Commented Oct 18, 2014 at 19:23

Souradeep Sinha · Accepted Answer · 2014-10-18 20:26:50Z

3

Thanks to @rubberboots for the help.

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

void main()
{
    FILE *fp = fopen("user.dat", "r");
    const char s[2] = ", ";
    char *token;
    int i;
    if(fp != NULL)
    {
        char line[20];
        while(fgets(line, sizeof line, fp) != NULL)
        {
            token = strtok(line, s);
            for(i=0;i<2;i++)
            {
                if(i==0)
                {   
                    printf("%s\t",token);
                    token = strtok(NULL,s);
                } else {
                    printf("%d\n",atoi(token));
                }       
            }
        }
        fclose(fp);
    } else {
        perror("user.dat");
    }   
}

user.dat file:

1000, 76

0095, 81

2910, 178

0001, 1

Output:

1000 76

0095 81

2910 178

0001 1

answered Oct 18, 2014 at 20:26

Souradeep Sinha

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2 Comments

chux Over a year ago

Curious, why print the string version of what was read for the first number and use a number version for the second number? Would not is be more consistent to either print both as strings or both as numbers?

Souradeep Sinha Over a year ago

Assignment woes. It doesn't make much sense to me as well. I guess the professor wanted us to learn and kill two birds with one printf statement. :P

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