[C++ Quiz] Intermediate level

Question 1

Can you name the special functions a C++ compiler can create implicitly?
tip answer

Question 2

What are the two ways to achieve automatic type conversion from type X to type Y?
tip answer

Question 3

Which of one of these represents an assignment operation?

C c1 = c2;
c3 = c4;
both

tip answer

Question 4

Given the class Qz4:

class Qz4 {
enum{ arr_l=5 };
int *arr; // array of int
int seed;
char *name;
public:
Qz4(char *str, int i) : name(str), seed(i) {
arr = new int[arr_l];
for(int i=0;i<arr_l;arr[i]=seed + i++);
}
~Qz4() {
delete [] arr;
cout << "arr destroyed for " << name << endl;
}
void print_arr() {
cout << name << ":" << endl;
for(int i=0;i<arr_l;i++) cout << "Element #" << i << "=" << get_arr(i) << endl;
}
void set_arr(int idx, int val) {
arr[idx]=val;
}
int get_arr(int idx) {
return arr[idx];
}
};

Can you predict the output of the program below?

int main() {
Qz4 q1("Q1",0), q2("Q2",10);
q2=q1;
q1.set_arr(0, 32);
q2.set_arr(1, 56);
q1.print_arr();
q2.print_arr();
}

answer

转载于:https://www.cnblogs.com/rickiedu/archive/2009/05/06/1450867.html

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