CODEWITHSUNDEEP
cfile-io
user6595053
user6595053

Reputation: 39

Reading multiple lines at a time in text file - C

I have an input file basically like this:

Group 1

Gabe Theodore Simon

Score 10

Group 2

Josh James Matthew

Score 9

I usually use fscanf in reading files but I do not know how to use it in reading three lines at a time. I am still new to c so can someone please help me?

EDIT: Sorry I forgot to say that the group members isn't always 3. It can even be hundreds

Upvotes: 1

Views: 5334

Answers (3)

BLUEPIXY
BLUEPIXY

Reputation: 40145

like this:

char group[32], name[128], score[32];
FILE *fp = fopen("score.txt", "r");
while(3 == fscanf(fp, "%31[^\n]%*c%127[^\n]%*c%31[^\n]%*c", group, name, score)){
    printf("%s, %s, %s\n", group, name, score);
}
fclose(fp);

Upvotes: 1

itsmrbeltre
itsmrbeltre

Reputation: 442

Here, I refactored everything I had previously thought about. I am providing a fresh solution to get lines in a text file using C tools. I was able to achieved such by combining different programming techniques such as the following:

  • Regex

  • C provided functions:

    scanf() : collects the string
    getchar() : checks for the end of the file 

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

#define MAXSIZE 500

int
main(void) {
    char line[MAXSIZE];
    while (scanf("%499[^\n]", line)== 1 && getchar() != EOF) {
    printf("%s\n", line);
  }

  return 0;
}

Steps to run this C code from terminal:

  1. Create a text file
  2. Compile the C code
  3. Run it by redirecting text file: ./(executable_goes_here) < (text_file_created_goes_here)

Upvotes: 0

RoadRunner
RoadRunner

Reputation: 26315

You can read line by line from the file using fgets.

Something like this will get you started:

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

#define MAXSIZE 100

int
main(void) {
    FILE *fp;
    char line[MAXSIZE];

    fp = fopen("yourfile.txt", "r");
    if (fp == NULL) {
        fprintf(stderr, "%s\n", "Error reading from file");
        exit(EXIT_FAILURE);
    }

    while (fgets(line, MAXSIZE, fp) != NULL) {
        printf("%s\n", line);
    }

    fclose(fp);

    return 0;
}

Upvotes: 2

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