foo.c: In function 'main':
foo.c:6:17: warning: format '%f' expects argument of type 'float *', but argument 2 has type 'int *' [-Wformat=]
    6 |         scanf("%f",&n);
      |                ~^  ~~
      |                 |  |
      |                 |  int *
      |                 float *
      |                %d
foo.c:7:14: warning: format '%f' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
    7 |     printf("%f",n-1);
      |             ~^  ~~~
      |              |   |
      |              |   int
      |              double
      |             %d

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