/in/foo.cc: In function 'int update(int, int, int)':
/in/foo.cc:18:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int pushup(int, int, int)':
/in/foo.cc:22:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int turnleft(int)':
/in/foo.cc:47:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int turnright(int)':
/in/foo.cc:71:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^