foo.c: In function 'main':
foo.c:7:23: warning: format '%f' expects argument of type 'float *', but argument 4 has type 'double *' [-Wformat=]
    7 |         scanf("%d %d %f",&a,&m,&k);
      |                      ~^        ~~
      |                       |        |
      |                       float *  double *
      |                      %lf

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