Question

I am trying to split a line using strtok which has tab delimiter.My code and input is as below. I would like to store these tokens into field1,field2,field3.

Code:

while(fgets(line,80,fp1)!=NULL) //Reading each line from file to calculate the file size.
{
    field1=strtok(line," ");
    //field1=strtok(NULL,"");
    field2=strtok(NULL," ");
    field3=strtok(NULL," ");
    if(flag != 0)
    printf("%s",field1);
    flag++;
}

Input:

315     316     0.013
315     317     0.022
316     317     0.028
316     318     0.113
316     319     0.133
318     319     0.051
320     324     0.054
321     322     0.054

My current output:(If I print field1)

315     316     0.013
315     317     0.022
316     317     0.028
316     318     0.113
316     319     0.133
318     319     0.051
320     324     0.054
321     322     0.054

Answer 1

I would suggest just using sscanf. It handles tabs as delimiters for you.

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

int
main()
{
    char line[80], field1[32], field2[32], field3[32];
    FILE *fp;

    fp = fopen("testfile", "r");
    if (fp == NULL) {
            printf("Could not open testfile\n");
            exit(0);
    }

    while (fgets(line, sizeof(line), fp) != NULL) {
            sscanf(line, "%s%s%s", field1, field2, field3);
            printf("%s %s %s\n", field1, field2, field3);
    }

    exit(0);
}