/in/foo.cc: In function 'int main()':
/in/foo.cc:6:1: error: expected initializer before 'cin'
    6 | cin>>a>>b>>c;
      | ^~~
/in/foo.cc:5:5: warning: unused variable 'a' [-Wunused-variable]
    5 | int a,b,c
      |     ^