Unexpected result after printing a string in c

Question

The code is -

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

int main()
{
    FILE *filevar;
    filevar = fopen("file", "r");
    char copy [100];
    int i = 0;

    while(1)
    {
        char ch = fgetc(filevar);
        if(ch==EOF)
        {
            break;
        }
        copy[i] = ch;
        i++;
    }
    printf("\n%s", copy);
    fclose(filevar);
    return 0;
}

When I run it the out put I get is

textblabla■a

file content is -

textblabla

Changing the file content changes the random charecters at end

You have to add a NUL character (`'\0'`) after the last character if you want to use `copy` as a string like in `printf("\n%s", copy);` — Bodo, Dec 16 '21 at 12:12
[Why does fgetc() return int instead of char?](https://stackoverflow.com/q/49063518/995714) — phuclv, Dec 16 '21 at 12:27

score 0 · Accepted Answer · answered Dec 16 '21 at 12:13

0

Two main issues.

ch has to be int
You do not null character terminate the string

        int ch = fgetc(filevar);
        if(ch==EOF)
        {
            copy[i] = 0;
            break;
        }
        
        copy[i] = ch;
        i++;

answered Dec 16 '21 at 12:13

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Unexpected result after printing a string in c

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