foo.cc: In function 'int main()':
foo.cc:9:15: warning: format '%f' expects argument of type 'float*', but argument 2 has type 'double*' [-Wformat=]
  scanf("%f",&x)
             ~~^
foo.cc:10:2: error: expected ';' before 'y'
  y=(5.0/9)*(x-32);
  ^
foo.cc:9:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%f",&x)
  ~~~~~^~~~~~~~~

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