假设以下C++源文件:#includeclassBaseTest{public:inta;BaseTest():a(2){}virtualintgB(){returna;};};classSubTest:publicBaseTest{public:intb;SubTest():b(4){}};classTriTest:publicBaseTest{public:intc;TriTest():c(42){}};classEvilTest:publicSubTest,publicTriTest{public:virtualintgB(){returnb;}};intmain(){EvilT