foo.cc: In function 'int main()':
foo.cc:9:30: error: 'X' was not declared in this scope
  price=99*x+99*0.5*y+99*0.55*X;
                              ^
foo.cc:8:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d,%d,%d",&x,&y,&z);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~

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