foo.cpp: In function 'int check()':
foo.cpp:6:17: error: 'n' was not declared in this scope
foo.cpp:10:1: error: a function-definition is not allowed here before '{' token
foo.cpp:32:1: error: expected '}' at end of input
foo.cpp:32:1: warning: no return statement in function returning non-void [-Wreturn-type]