有如下程序：
#include＜iostream＞
using namespaee std；
class A
public：
A( )cout＜＜"A"；
～A( )cout＜＜"A"；
；
class B
A a；
public：
B( )cout＜＜"B"；
～B( )t cout＜＜"B"；
；
int main( )
B b；
return 0；
程序的输出结果是______。
参考答案：ABBA
解析： 在类中出现对象变量时，在创建本类对象时先调用对象变量的构造函数，然后调用本类的构造函数，在撤销时则相反，先调用本类的析构函数，然后调用对象变量的析构函数。
In those poor times, many of my classmates couldn’t bring a nice meal to school for lunch. My deskmate’s meal was always cabbages, while 66 （我的）was ham and fried eggs. Sometimes, my deskmate would first pick the hair out of his lunch and then eat it as if 67 （没事）had happened. This continued for a long time. “His mother is so lousy（邋遢的）that her hair drops in the meal, ”my classmates said. I 68 （想）it was really dirty, but I couldn’t show that because I didn’t want to hurt（伤害）his feelings. Still, I started to think that he was 69 （肮脏）, too. One day after school, he called me and said, “Would you like to come to my house if you are 70 （有空）? ” Though I didn’t want to go, I knew it would be impolite to refuse because this was his first invitation. Following my friend, we 71 （到达）at a poor village. “Mom, I brought my friend home. ” His old mother opened the 72 （门）, “My son’s friend is here. Let me have a look. ”But to my 73 （惊讶）, his mother was blind. She couldn’t see anything. I felt sad. Now I understood why my deskmate’s lunch had hair in it. His mother got ready for it 74 （仔细）for him every day, even though she was blind. It was not only a lunch, but also a 75 （母亲）love. |