foo.cc:11:9: warning: missing terminating " character
  printf("%d,%d,a,b)   
         ^
foo.cc:11:9: error: missing terminating " character
  printf("%d,%d,a,b)   
         ^~~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:12:1: error: expected primary-expression before '}' token
 }
 ^
foo.cc:7:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d,%d",&a,&b);
  ~~~~~^~~~~~~~~~~~~~~

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