题型:填空题 如下程序运行时的输出结果是 #include<iostream> using namespace std; class ONE int c; public: ONE( ):c(0)eout<<1; ONE(int n):C(n)cout<<2; ; class TW0 ONE onel; ONE one2; public: TWO(int m):one2(m)eout<<3; ; int main( ) TWO t(4); return 0; A) 3 B) 23 C) 123 D) 213 查看答案