1  #include <stdio.h>
       2  #include <stdlib.h>
       3  
       4  int
       5  main (void)
       6  {
       7    double d;
       8    int c;
       9  
      10    if (scanf ("%lg", &d) != 0)
      11      {
      12        printf ("scanf didn't failed\n");
      13        exit (1);
      14      }
      15    c = getchar ();
      16    if (c != ' ')
      17      {
      18        printf ("c is `%c', not ` '\n", c);
      19        exit (1);
      20      }
      21  
      22    return 0;
      23  }