/in/foo.cc: In function 'int add(int, int, int)':
/in/foo.cc:23:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'void checkans()':
/in/foo.cc:28:15: warning: unused variable 'tot' [-Wunused-variable]
  int now = 1, tot = res, temp = 0;
               ^~~