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char buff [25];
char *end_ptr;
long long_varsl;
int int_varsi;

fgets(buff, sizeof buff, stdin);

errno = 0;

long_varsl = strtol(buff, &end_ptr, 0);

if (ERANGE == errno) {
  puts("number out of range\n");
}
else if (long_varsl > INT_MAX) {
  printf("%ld too large!\n", long_varsl);
}
else if (long_varsl < INT_MIN) {
  printf("%ld too small!\n", long_varsl);
}
else if (end_ptr == buff) {
  printfputs("not valid numeric input\n");
}
else {
  int_varsi = (int)long_varsl;
}