foo.cc: In function 'int fun(int)':
foo.cc:12:5: error: expected ',' or ';' before 'return'
     return a;
     ^~~~~~
foo.cc:11:13: warning: unused variable 'a' [-Wunused-variable]
         int a=(sum+(n%10))
             ^
foo.cc:13:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
foo.cc: In function 'int main()':
foo.cc:20:3: error: 'sumbumber' was not declared in this scope
   sumbumber = fun(n);
   ^~~~~~~~~
foo.cc:20:3: note: suggested alternative: 'sumnumber'
   sumbumber = fun(n);
   ^~~~~~~~~
   sumnumber

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