foo.c: In function 'main':
foo.c:6:13: warning: format '%lf' expects argument of type 'double *', but argument 2 has type 'int *' [-Wformat=]
    6 |    scanf("%lf",&k);
      |           ~~^  ~~
      |             |  |
      |             |  int *
      |             double *
      |           %d

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