Problem with reading strings from File in C without string library

Question

I'm experiencing a problem in the resolution of an exercise. I need to read N strings from file, but I can only read the first. How can I fix it?

#include <stdio.h>    

int main() {

 /* variable declarations */

   FILE *fp;
   char vet[100];


   fp = fopen("file.txt","r");  /* open file with N strings */

   while(!feof(fp)) {
     fgets(vet, 100, fp);
     vet[100]='\0';
     printf("%s\n", vet);  
   }

}

`char vet[100];` then `vet[100]='\0';` <-- Boom ! (arrays indexes start at 0) — Cid, Mar 28 '19 at 13:59
Also you should make sure to call `fclose` when you're done with the file. — Evan M, Mar 28 '19 at 14:05
[Why is “while (!feof(file))” always wrong?](https://stackoverflow.com/questions/5431941/why-is-while-feoffile-always-wrong) — Lundin, Mar 28 '19 at 14:13

score 2 · Answer 1 · edited Mar 28 '19 at 14:29

2

vet[100]='\0' this will generate error in runtime, also you don't need this line of code because fgets will handle the end of the string itself.

edited Mar 28 '19 at 14:29

Jabberwocky

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answered Mar 28 '19 at 14:00

Ismail

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It's true! It woooork now! Thank's a lot! – simone golino Mar 28 '19 at 14:02
1

@simonegolino you still may need to handle the `\n` that `fgets` adds at the end of the string. – Jabberwocky Mar 28 '19 at 14:29
1

@simonegolino _"this will generate error in runtime"_, no this statement is wrong. It triggers _undefined behaviour_ which is roughly anything between "program crashes instantly" and "apparently working fine". – Jabberwocky Mar 28 '19 at 14:30

Problem with reading strings from File in C without string library

1 Answers1