C、C++、Python、Ruby的关键字

	C语言	C++	Python	Ruby	PHP
判断	if	if	if
	else	else	else
			elif
循环	for	for	for
	while	while	while
	break	break	break
	continue	continue	continue
			in
	return	return	return
逻辑运算	and	and	and
	or	or	or
面向对象	class	class	class
异常	try	try	try