習(xí)題與編程實(shí)踐程序閱讀題

1、友元程序閱讀題題1.分析以下程序的執(zhí)行結(jié)果#includeclass Sample int n; public: Sample() Sample (int m)n=m; friend void square(Sample &s) s.n=s.n*s.n; void disp() coutn=nendl; ;void main() Sample a(10); square(a); a.disp();題2.分析以下程序的執(zhí)行結(jié)果#includeclass B;class A int i; friend B; void disp()coutiendl;class B public: void set

2、(int n) A a; a.i=n; / i是對(duì)象a的私有數(shù)據(jù)成員，在友元類可以使用 a.disp(); / disp()是對(duì)象a的私有成員函數(shù)，在友元類可以使用 ;void main() B b; b.set(2);題3.分析以下程序的執(zhí)行結(jié)果#includeclass teacher;class student char *name; public: student(char *s)name=s; friend void print(student &,teacher &);class teacher char *name; public: teacher(char *s)name=s;

3、 friend void print(student &,teacher &);void print(student &a,teacher &b) coutthe student is:endl; coutthe teacher is:endl;void main() student s(Li Hu); teacher t(Wang Ping); print(s,t);04.分析以下程序的執(zhí)行結(jié)果#includeclass Sample int n; public: Sample(int i)n=i; friend int add(Sample &s1,Sample &

4、s2);int add(Sample &s1,Sample &s2) return s1.n+s2.n;void main() Sample s1(10),s2(20); coutadd(s1,s2)endl;05。分析以下程序的執(zhí)行結(jié)果#includeclass B;class A int i; public: int set(B&); int get()return i; A(int x)i=x;class B int i; public: B(int x)i=x; friend A;int A:set(B &b) / 由于使用了類B的定義，故本函數(shù)的定義應(yīng)放在類B定義之后 return i=b.i;void