下列程序的输出结果是 _____ 。 #include using namespace std; class Test { public: Test() { cnt++; } ~Test() {cnt--; } static int Count() { returncnt;} private: static int cnt; }; int Test::cnt = 0; int main() { cout << Test::Count()<<' '; Test tl, t2; Test* pT3 = new Test; Test* pT4 = new Test; cout << Test::Count()<<' '; delete pT4; delete pT3; cout << Test::Count()<< endl; return 0; }
举一反三
- 阅读以下程序，写出运行结果。 #include using namespace std; class Test { private: int num; public: Test(); Test(int n); }; Test::Test() { cout << "Init defa" << endl; num = 0; } Test::Test(int n) { cout << "Init" << " " << n << endl; num = n; } int main() { Test x[2]; Test y(15); return 0; }
- 下列代码的执行结果是 。public class Test {public int aMethod(){static int i=0;i++;System.out.println(i);}public static void main(String args[ ]){Test test = new Test();test.aMethod();}}
- 下列代码中,将引起一个编译错误的行是______。 1)public class Test{ 2) int m,n; 3) public Test(){} 4) public Test(int a){m=a;} 5) public static void main(String args[]){ 6) Test t1,t2; 7) int j,k; 8) j=0;k=0; 9) t1=new Test(); 10) t2=new Test(j,k); 11) } 12) }
- 给出下面代码段 1) public class Test { 2) int m, n; 3) public Test() {} 4) public Test(int a) { m=a; } 5) public static void main(String arg[]) { 6) Test t1,t2; 7) int j,k; 8) j=0; k=0; 9) t1=new Test(); 10) t2=new Test(j,k); 11) } 12) } 哪行将引起一个编译时错误？
- （6-6）请阅读程序，写出程序运行结果。 class Test{ static int x=10; int y=99; { y=y+10; } static { x=x+5; } { y=y+10; } static { x=x+5; } public Test() {//构造方法 x=x+5; } { System.out.println(x*y); } } public class Demo11 { public static void main(String[] args) { Test t1=new Test(); Test t2=new Test(); } }