/in/foo.cc: In function 'int main()':
/in/foo.cc:13:6: error: 'i' was not declared in this scope
  for(i = 0; i < n; i++)
      ^
/in/foo.cc:23:7: error: 'j' was not declared in this scope
   for(j = 0; j < n; j++)
       ^
/in/foo.cc:28:6: error: 'j' was not declared in this scope
   if(j != i)
      ^
/in/foo.cc:30:14: error: 'j' was not declared in this scope
   temp = num[j];
              ^