C ++ interview questions, interview questions

C ++ interview questions, interview questions

Run the following code:

1 A * pa = new A [10]; 2 delete pa;

The constructor and destructor of Class A are executed () times respectively.
A.1, 1 B .10, 10 C.1, 10 D.10, 1

 

Test:

# Define _ CRT_SECURE_NO_WARNINGS # include <iostream> using namespace std; class A {public: A () {cout <"constructor" <endl ;}~ A () {cout <"destructor a =" <a <endl;} void setA (int a) {this-> a = a;} protected: private: int a ;}; int main (void) {A * p = new A [10]; for (int I = 0; I <10; ++ I) {p [I]. setA (I);} delete p; cout <"Hello World! "<Endl; system (" pause "); return 0 ;}

Test results:

 

Because it is delete p rather than delete [] p, only P [0] is parsed.