Question

Instead of appending “abc” (and thus eventually getting a file full of abcabcabc….), no matter how many times I run this, myfile only containst “abc”…. how can I append?

#include <stdio.h>
#include <string.h>

int main(){
    char strng[10];
    strcpy(strng,"abc");
    FILE *my_file;
    my_file = fopen("myfile","a+");
    if (my_file == NULL){ printf("problem\n");}
    fwrite(strng, sizeof(strng), 1, my_file);
    printf("appending %s\n",strng);
    fclose(my_file);
}

Answer 1

Apart from the fact that:

fwrite(strng, sizeof(strng), 1, my_file);

should be:

fwrite(strng, strlen(strng), 1, my_file);

it works for me.