foo.cc: In function 'int main()':
foo.cc:10:5: error: expected primary-expression before '/' token
   10 |     / *
      |     ^
foo.cc:11:5: error: expected primary-expression before 'int'
   11 |     int a,b,c;
      |     ^~~
foo.cc:13:10: error: 'a' was not declared in this scope
   13 |     cin>>a>>b>>c;
      |          ^
foo.cc:13:13: error: 'b' was not declared in this scope
   13 |     cin>>a>>b>>c;
      |             ^

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