How to scanf only integer?

by
  1. You take scanf().
  2. You throw it in the bin.
  3. You use fgets() to get an entire line.
  4. You use strtol() to parse the line as an integer, checking if it consumed the entire line.
char *end;
char buf[LINE_MAX];

do {
     if (!fgets(buf, sizeof buf, stdin))
        break;

     // remove \n
     buf[strlen(buf) - 1] = 0;

     int n = strtol(buf, &end, 10);
} while (end != buf + strlen(buf));

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