foo.cc: In function 'int main()':
foo.cc:27:13: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   27 |         if(f=0)cout<<"success on day "<<d<<endl;
      |            ~^~
foo.cc:13:18: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
   13 |                 d++;
      |                 ~^~
foo.cc:14:24: warning: 'v' may be used uninitialized in this function [-Wmaybe-uninitialized]
   14 |                 h1+=v;v=v*0.9;
      |                       ~^~~~~~

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