Read characters with space characters from text file in C

Question

I try to read text file looks like

int main() 
{
FILE *file;

char k[200][2];
int i=0;

if((file=fopen("blobs1.txt","r"))!=NULL);
{
        
    while(!feof(file))
    {
     fscanf(file,"%s",&k[i]);
     printf("%s",k[i]);
         
    
}
    
}

and result is:1020xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

but I want it to be like the picture.Where am I doing wrong ? Thank you.

Your `fscanf(...,"%s",...);` reads everything except for spaces — Vlad Feinstein, Oct 23 '20 at 23:21
You are using `feof` incorrectly: https://stackoverflow.com/questions/5431941/why-is-while-feof-file-always-wrong — William Pursell, Oct 23 '20 at 23:23
This might help: https://stackoverflow.com/questions/1950057/can-fscanf-read-whitespace — scrappedcola, Oct 23 '20 at 23:23
Your code does not appear to care about newlines at all. It seems that you are just trying to implement a standard `while( (c = fgetc(f)) != EOF ) putchar(c);` — William Pursell, Oct 23 '20 at 23:25
General rule: if you are a beginner (or intermediate, whatever that means) with C, do *not* use scanf. At all. Avoid it until you have (literally) 15 years of experience with the language. — William Pursell, Oct 23 '20 at 23:28

MikeCAT · Answer 1 · 2020-10-23T23:31:15.773

fscanf() with %s will skip whitespace character. You should use fgets() to read whole lines.

Also your usage of while(!feof(file)) is wrong and you should check if readings are successful before using what are "read".

Another note is that having semicolon in the if line is bad because it will disable the NULL check and have it try to read things from NULL when the fopen fails.

Try this:

#include <stdio.h>

int main(void)
{
    FILE *file;

    char k[200][2];
    int i=0;

    if((file=fopen("blobs1.txt","r"))!=NULL)
    {
        
        while(fgets(k[i], sizeof(k[i]), file) != NULL)
        {
            printf("%s",k[i]);
            
        
        }
        
        fclose(file);
    }
}

Thank's a lot,I appreciate that – yayayax Oct 23 '20 at 23:31 — yayayax, Oct 23 '20 at 23:31

score 0 · Answer 2 · answered Oct 23 '20 at 23:23

0

If you really want scanf/fscanf, try "[^\n]" instead of "%s". It will read until the line terminator '\n' or end the of the file.

answered Oct 23 '20 at 23:23

Gabriel

106
4

Read characters with space characters from text file in C

2 Answers2