C++中的类和对象.ppt

;FAQ1;;;;;FAQ2;;;#include iostream.h #includestring.h class Stu { private: char name[20]; int age; char sex[10]; public: Stu(char c1[20],char c2[10],int n); //构造函数 void stuinfo(); ~Stu(); //析构函数 }; Stu::Stu(char c1[20],char c2[10],int n) //构造函数定义 { cout “constructor called!”endl; strcpy(name,c1); strcpy(sex,c2); age=n; } ; operator char*() //重载char*类型 { return mp; //返回mp } }; int main() { Test t=Test(cs.nju.edu.cn); char *p=t; coutcall fun beforeendl; coutlenstrlen(p)endl; coutendendl; return 0; } ;FAQ4;#includeiostream.h class Test { public: Test(int a) //构造函数 { num=a; } void setnum(int a) { num=a; } int getnum() { return num; } private: int num; }; void add(Test t) //类对象作为函数参数 { t.setnum(t.getnum()+t.getnum()); cout\nnum value add.; coutt.getnum()endl; } int main() { Test tt(100); //调用构造函数 add(tt); //调用函数add()，参数按值传递 coutobject tt changed is main.; couttt.getnum()endl; return 0; } ;#includeiostream.h class Test { public: Test(int a) //构造函数 { num=a; } void setnum(int a) { num=a; } int getnum() { return num; } private: int num; }; void add(Test *t) //类对象作为函数参数 { t-setnum(t-getnum()+t-getnum()); cout\nnum value add.; coutt-getnum()endl; } int main() { Test tt(100); //调用构造函数 add(tt); //调用函数add()，参数按值传递 coutobject tt changed is main.; couttt.getnum()endl; return 0; };#includeiostream.h class Test { public: Test(int a) //构造函数 { num=a; } void setnum(int a) { num=a; } int getnum() { return num; } private: int num; }; void add(Test t) //类对象作为函数参数 { t.setnum(t.getnum()+t.getnum()); cout\nnum value add.; coutt.getnum()endl; } int main() { Test tt(100); //调用构造函数 add(tt); //???用函数add()，参数按值传递 coutobject tt changed is main.; couttt.getnum()endl; return 0; };FAQ5;;;FAQ6;#includeiostream.h class Time{ public: Time() {//构造函数Time() hour=0; minute=0; sec=0; } void set_Time(); void show_Time(); private: int hour; int minute; int sec; }; int main(){ Time t1;