foo.c: In function 'main':
foo.c:7:17: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'float *' [-Wformat=]
    7 |         scanf("%d",&k);
      |                ~^  ~~
      |                 |  |
      |                 |  float *
      |                 int *
      |                %e
foo.c:15:18: warning: format '%f' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
   15 |         printf("%f",n);
      |                 ~^  ~
      |                  |  |
      |                  |  int
      |                  double
      |                 %d

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