![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-53/ti_inject-812ce.png)
若有以下程序: include<iostream> using namespace std; class TestClass 1 { public: TestClass1() { X=0; } int x; }; class TestClass2:virtual public TestClass1 { public: TestClass2() { x=10; } }; class TestClass3:virtual public TestClass 1 { public: TestClass3() { x=20; } }; class TestClass4:public TestClass2, protected TestClass3 { }; int main() { TestClass4 obj; cout<<obj.x<<end1; return 0: } 该程序运行后的输出结果是______。