[user02@FC4 Lesson04]$ cat -n floating.c

   1  #include <stdio.h>
   2
   3  int main(void)
   4  {
   5     printf("%f\n", 0.12345);
   6
   7     return 0;
   8  }

[user02@FC4 Lesson04]$ gcc -o floating floating.c
[user02@FC4 Lesson04]$ ./floating
0.123450