FILE *in = fopen(fname, "r");
if(in == NULL) {
fprintf(stderr, "Couldn't open '%s': %s\n", fname, strerror(errno));
exit(1);
}
FILE *in = fopen(fname, "r");
if(in == NULL) {
fprintf(stderr, "Couldn't open '%s': %s\n", fname, strerror(errno));
exit(1);
}