foo.cc: In function 'int main()':
foo.cc:9:14: warning: format '%f' expects argument of type 'double', but argument 2 has type 'float*' [-Wformat=]
    9 |   printf("%.1f",&e);
      |           ~~~^  ~~
      |              |  |
      |              |  float*
      |              double

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