/in/foo.c: In function 'main':
/in/foo.c:5:18: warning: format '%f' expects argument of type 'float *', but argument 2 has type 'double *' [-Wformat=]
    5 |         scanf("%1f", &f);
      |                ~~^   ~~
      |                  |   |
      |                  |   double *
      |                  float *
      |                %1lf