{"id":"58954449","type":"page","status":"current","title":"02.面向对象程序设计案例","version":{"by":{"type":"known","username":"ethanliu","userKey":"2c90931b6cfb654f016d5c69becc0001","profilePicture":{"path":"/images/icons/profilepics/default.svg","width":48,"height":48,"isDefault":true},"displayName":"刘浩","_links":{"self":"https://wiki.suncaper.net/rest/api/user?key=2c90931b6cfb654f016d5c69becc0001"},"_expandable":{"status":""}},"when":"2022-07-09T01:51:24.000Z","message":"","number":1,"minorEdit":false,"hidden":false,"_links":{"self":"https://wiki.suncaper.net/rest/experimental/content/58954449/version/1"},"_expandable":{"content":"/rest/api/content/58954449"}},"body":{"storage":{"value":"<ac:layout><ac:layout-section ac:type=\"two_right_sidebar\"><ac:layout-cell><h2><span>4.2 </span>面向对象程序设计案例</h2><h3><span>4.2.1 </span>设计立方体类</h3><p>设计立方体类<span>(Cube)</span>，求出立方体的面积<span>( 2*a*b + 2*a*c + 2*b*c )</span>和体积<span>( a * b * c)</span>，分别用全局函数和成员函数判断两个立方体是否相等。</p><p><ac:image ac:thumbnail=\"true\" ac:height=\"173\"><ri:attachment ri:filename=\"image2021-5-8_12-15-49.png\" /></ac:image></p><ac:structured-macro ac:name=\"code\" ac:schema-version=\"1\" ac:macro-id=\"11ce75f3-ecf9-4ac8-81f3-ff85cd89a18a\"><ac:parameter ac:name=\"language\">cpp</ac:parameter><ac:plain-text-body><![CDATA[//立方体类\nclass Cub{\npublic:\n\tvoid setL(int l){ mL = l; }\n\tvoid setW(int w){ mW = w; }\n\tvoid setH(int h){ mH = h; }\n\tint getL(){ return mL; }\n\tint getW(){ return mW; }\n\tint getH(){ return mH; }\n\t//立方体面积\n\tint caculateS(){ return (mL*mW + mL*mH + mW*mH) * 2; }\n\t//立方体体积\n\tint caculateV(){ return mL * mW * mH; }\n\t//成员方法\n\tbool CubCompare(Cub& c){\n\t\tif (getL() == c.getL() && getW() == c.getW() && getH() == c.getH()){\n\t\t\treturn true;\n\t\t}\n\t\treturn false;\n\t}\nprivate:\n\tint mL; //长\n\tint mW; //宽\n\tint mH; //高\n};\n\n//比较两个立方体是否相等\nbool CubCompare(Cub& c1, Cub& c2){\n\tif (c1.getL() == c2.getL() && c1.getW() == c2.getW() && c1.getH() == c2.getH()){\n\t\treturn true;\n\t}\n\treturn false;\n}\n\nvoid test(){\n\tCub c1, c2;\n\tc1.setL(10);\n\tc1.setW(20);\n\tc1.setH(30);\n\n\tc2.setL(20);\n\tc2.setW(20);\n\tc2.setH(30);\n\n\tcout << \"c1面积:\" << c1.caculateS() << \" 体积:\" << c1.caculateV() << endl;\n\tcout << \"c2面积:\" << c2.caculateS() << \" 体积:\" << c2.caculateV() << endl;\n\n\t//比较两个立方体是否相等\n\tif (CubCompare(c1, c2)){\n\t\tcout << \"c1和c2相等!\" << endl;\n\t}\n\telse{\n\t\tcout << \"c1和c2不相等!\" << endl;\n\t}\n\n\tif (c1.CubCompare(c2)){\n\t\tcout << \"c1和c2相等!\" << endl;\n\t}\n\telse{\n\t\tcout << \"c1和c2不相等!\" << endl;\n\t}\n}]]></ac:plain-text-body></ac:structured-macro><h3><span>4.2.2 </span>点和圆的关系</h3><p>设计一个圆形类（<span>AdvCircle</span>），和一个点类（<span>Point</span>），计算点和圆的关系。</p><p>假如圆心坐标为<span>x0, y0, </span>半径为<span>r</span>，点的坐标为<span>x1, y1</span>：</p><ul><li>点在圆上：<span>(x1-x0)*(x1-x0) + (y1-y0)*(y1-y0) == r*r</span></li><li>点在圆内：<span>(x1-x0)*(x1-x0) + (y1-y0)*(y1-y0) &lt; r*r</span></li><li>点在圆外：<span>(x1-x0)*(x1-x0) + (y1-y0)*(y1-y0) &gt; r*r</span></li></ul><p><br /></p><p><br /></p><p><br /></p><ac:structured-macro ac:name=\"code\" ac:schema-version=\"1\" ac:macro-id=\"95bffcf0-35cb-470f-8f4f-ade7b35989ef\"><ac:parameter ac:name=\"language\">cpp</ac:parameter><ac:plain-text-body><![CDATA[//点类\nclass Point{\npublic:\n\tvoid setX(int x){ mX = x; }\n\tvoid setY(int y){ mY = y; }\n\tint getX(){ return mX; }\n\tint getY(){ return mY; }\nprivate:\n\tint mX;\n\tint mY;\n};\n\n//圆类\nclass Circle{\npublic:\n\tvoid setP(int x,int y){\n\t\tmP.setX(x);\n\t\tmP.setY(y);\n\t}\n\tvoid setR(int r){ mR = r; }\n\tPoint& getP(){ return mP; }\n\tint getR(){ return mR; }\n\t//判断点和圆的关系\n\tvoid IsPointInCircle(Point& point){\n\t\tint distance = (point.getX() - mP.getX()) * (point.getX() - mP.getX()) + (point.getY() - mP.getY()) * (point.getY() - mP.getY());\n\t\tint radius = mR * mR;\n\t\tif (distance < radius){\n\t\t\tcout << \"Point(\" << point.getX() << \",\" << point.getY() << \")在圆内!\" << endl;\n\t\t}\n\t\telse if (distance > radius){\n\t\t\tcout << \"Point(\" << point.getX() << \",\" << point.getY() << \")在圆外!\" << endl;\n\t\t}\n\t\telse{\n\t\t\tcout << \"Point(\" << point.getX() << \",\" << point.getY() << \")在圆上!\" << endl;\n\t\t}\n\t}\nprivate:\n\tPoint mP; //圆心\n\tint mR; //半径\n};\n\nvoid test(){\n\t//实例化圆对象\n\tCircle circle;\n\tcircle.setP(20, 20);\n\tcircle.setR(5);\n\t//实例化点对象\n\tPoint point;\n\tpoint.setX(25);\n\tpoint.setY(20);\n\n\tcircle.IsPointInCircle(point);\n}]]></ac:plain-text-body></ac:structured-macro></ac:layout-cell><ac:layout-cell><p><br /></p></ac:layout-cell></ac:layout-section></ac:layout>","representation":"storage","_expandable":{"content":"/rest/api/content/58954449"}},"_expandable":{"editor":"","view":"","export_view":"","styled_view":"","anonymous_export_view":""}},"extensions":{"position":"none"},"_links":{"webui":"/pages/viewpage.action?pageId=58954449","edit":"/pages/resumedraft.action?draftId=58954449","tinyui":"/x/0ZKDAw","collection":"/rest/api/content","base":"https://wiki.suncaper.net","context":"","self":"https://wiki.suncaper.net/rest/api/content/58954449"},"_expandable":{"container":"/rest/api/space/2CT","metadata":"","operations":"","children":"/rest/api/content/58954449/child","restrictions":"/rest/api/content/58954449/restriction/byOperation","history":"/rest/api/content/58954449/history","ancestors":"","descendants":"/rest/api/content/58954449/descendant","space":"/rest/api/space/2CT"}}