foo.c:6:1: warning: return type defaults to 'int' [-Wimplicit-int]
    6 | main()
      | ^~~~
foo.c: In function 'main':
foo.c:8:23: warning: format '%d' expects argument of type 'int *', but argument 4 has type 'float *' [-Wformat=]
    8 |         scanf("%d %d %d", &a, &m, &k);
      |                      ~^           ~~
      |                       |           |
      |                       int *       float *
      |                      %e

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