从键盘输入两个矩阵,输出这两个矩阵和这两个矩阵相乘的矩阵,图书管理系统的一小部分 要求能 登陆 注册 推出 登陆要有次数限制（失败三次退出程序等），注册信息要求写入到文本文件里保存,已知圆半径r=2.5 圆柱高h=4,求圆的周长，面积，圆球体积，圆柱体积，用cin输入要计算的项目，然后输出计算结果，输入输出时要有文字提示,求1！+2！。。。+10！c语言代码,贪吃蛇游戏的C语言代码,求几个带权字符的哈夫曼编码,本打字游戏可进行英文，其它字符和全部字符的打字训练，每次训练若干个字符并进行打字时间，速度，正确率的统计显示,数值分析的龙贝格求积代码(C语言),以足球,篮球,羽毛球.性别.为内容设置checkbox,raidobutton.并且设置确定跟退出按钮,确定时候弹出消息框显示出你所选的checkbox,raidobutton内容,建立数据库，创建表，进行简单的查询，删除，修改即可，这些事件是点击按钮时发生的,Checkbox ,RADIONBUTTON,的简单事例代码,要求确定返回一些关于这些对象的内容 ,DialogBoxSquareFigureTranscr iptExitframe的实例源代码.

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