/in/foo.cc: In function 'int main()':
/in/foo.cc:21:24: error: expected ')' before ';' token
  while (~scanf("%d",&n);)
                        ^
/in/foo.cc:21:2: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
  while (~scanf("%d",&n);)
  ^~~~~
/in/foo.cc:21:25: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'while'
  while (~scanf("%d",&n);)
                         ^
/in/foo.cc:21:25: error: expected primary-expression before ')' token