foo.cc: In function 'int main()':
foo.cc:44:17: error: 'cun' was not declared in this scope
  printf("%.0lf",cun*1.2+sheng);
                 ^~~
foo.cc:44:25: error: 'sheng' was not declared in this scope
  printf("%.0lf",cun*1.2+sheng);
                         ^~~~~
foo.cc:44:25: note: suggested alternative: 'setenv'
  printf("%.0lf",cun*1.2+sheng);
                         ^~~~~
                         setenv
foo.cc:11:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&bugst);
   ~~~~~^~~~~~~~~~~~~

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