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9-4 Number of diners: In the program written to complete Exercise 9-1, add an attribute named number_served and set its default value to 0. Create an instance named restaurant from this class; Print how many people have eaten in this restaurant, then modify this value and print it again. ?就那些乌合之众。香儿笑道：大姐，陆老大死了，就没人认得鲁三叔和我了。官方宣布第二季The host is the most important. People input data to the host computer through keyboard, mouse and other input devices. After data processing by the host computer, the results are output to us through output devices such as displays and printers. The main components of the host include: memory, hard disk, motherboard, graphics card, sound card, optical drive, floppy drive, etc. Now many graphics card-like components can be integrated into the motherboard. CPU is also called central processing unit. CPU is the abbreviation of Central Processing Unit in English. As important as people's brains. It directs and dispatches all the work of the computer. Usually we refer to the CPU model when we say Ben 2, Ben 3 and Ben 4.帮帮龙探险队乘坐着比之前更加威武霸气的宇宙飞船，来到了宇宙中神秘的M25星球，据说这是个里面存在着各种各样恐龙的神秘星球！里面不仅大自然风光无限，还有各种各样有趣的新伙伴——这次不再是单单的动物伙伴了，更是添加了人类及同样是帮帮龙成员的伙伴！来自六维世界海奥华星球的原住民修行者秦多多在500年前奉星球元老的命令来到地球，却偶遇明朝的一个公主并结下一段刻骨民心的悲伤情缘；500年后，秦多多再次受命来完成2012之后的拯救地球的任务，并偶遇公主的转世紫荆高中的校花林慕花和她的朋友们，一个神一样的完美帅哥就这样出现在这个繁华都市的学校里，他会遭遇怎样的经历呢，爱情的悲剧这次会重演吗？秦多多第一次见到林慕花，她的一颦一笑都像极了花儿公主，和她在一起的日子里，公主的身影总是不断在秦多多心中闪现。在紫荆高中，秦多多遇到了很多人。有他的朋友，有他的敌人，还有一直躲在黑暗中的人。在第一季中，花儿被黑暗势力的人所劫持，秦多多在去营救她时却遭到暗算，险些丧命。