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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,*,课堂练习,分析中国象棋中走马的实际情况(下面未注明的均指的是对马的说明),1、如果落点在棋盘外,则不移动棋子;,2、如果落点与起点不构成日字型,则不移动棋子;,3、如果落点处有自己方棋子,则不移动棋子;,4、如果在落点方向的邻近交叉点有棋子(绊马腿),则不移动棋子;,5、如果不属于1-4条,且落点处无棋子,则移动棋子;,6、如果不属于1-4条,且落点处为对方棋子(非老将),则移动棋子并除去对方棋子;,7如果不属于1-4条,且落点处为对方老将,则移动棋子,并提示战胜对方,游戏结束。,因果分析,原因:,1、落点在棋盘上;,2、落点与起点构成日字;,3、落点方向的邻近交叉点无棋子;,4、落点处为自己方棋子;,5、落点处无棋子;,6、落点处为对方棋子(非老将);,7、落点处为对方老将。,结果:,E1、不移动棋子;,E2、移动棋子;,E3、移动棋子,并除去对方棋子;,E4、移动棋子,并提示战胜对方,结束游戏。,画出因果图,添加中间节点11,目的是作为导出结果的进一步原因,简化因果图导出的判定表,考虑结果不能同时发生,所以对其施加唯一约束O。原因5、6、7不能同时发生,所以对其施加异约束E.,1,3,4,5,E1,7,6,2,E2,E3,E4,11,V,V,V,V,V,E,将因果图转换成如下所示的决策表,规则,选项,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,1,2,3,4,1,1,1,1,1,1,1,0,1,1,0,1,1,1,0,0,1,0,1,1,1,0,1,0,1,0,0,1,1,0,0,0,0,1,1,1,0,1,1,0,0,1,0,1,0,1,0,0,0,0,1,1,0,0,1,0,0,0,0,1,0,0,0,0,11,E1,0,1,1,0,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,规则,选项,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,11,5,6,7,1,1,1,1,1,1,1,0,1,1,0,1,1,1,0,0,1,0,1,1,1,0,1,0,1,0,0,1,1,0,0,0,0,1,1,1,0,1,1,0,0,1,0,1,0,1,0,0,0,0,1,1,0,0,1,0,0,0,0,1,0,0,0,0,E2,E3,E4,1,0,0,0,1,0,0,0,1,决策表分解,规则,选项,1,2,3,4,5,6,7,8,1,2,3,1,1,1,1,1,0,1,0,1,1,0,0,0,1,1,0,1,0,0,0,1,0,0,0,11,E1,1,0,0,1,0,1,0,1,0,1,0,1,0,1,0,1,规则,选项,1,2,3,4,5,6,7,8,11,4,5,6,7,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,1,1,0,0,0,1,0,1,0,0,1,0,0,1,0,1,0,0,0,1,E1,E2,E3,E4,1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1,根据判定表给出测试用例,测试用例编号,输入数据,预期输出,1,落点在棋盘上且构成日字,没有自己方棋子,中间原因11,2,落点在棋盘上且构成日字但有自己方棋子,不移动棋子,3,落点在棋盘上但与落点不构成日字,不移动棋子,4,落点不在棋盘上,不移动棋子,5,落点在棋盘上且构成日字,没有自己方棋子但绊马腿,不移动棋子,6,落点在棋盘上且构成日字,没有自己方棋子且不绊马腿,落点处无棋子,移动棋子,7,落点在棋盘上且构成日字,没有自己方棋子且不绊马腿,落点处有对方棋子(非老将),移动棋子,并除去对方棋子,8,落点在棋盘上且构成日字,没有自己方棋子且不绊马腿,落点处有对方老将,移动棋子,并提示战胜对方,结束游戏,
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