更多"有以下程序 #include <iostream> using n"的相关试题:
[单项选择]若有以下程序 #include <iostream> using namespace std; class A { public: A(int i,int j) { a=i; b=j; } void move(int x,int y) { a+=x; b+=y; } void show( ) cout<<a<<","<<b<<end1; private int a,b; }; class B: private A { public: B(int i,int j):A(i,j) {} void fun( ) { move(3,5); } void fl( ) { A::show( ); } int main( ) { B d(3,4); d. fun( ); d.fl( ); return 0; } 程序执行后的输出结果是
A. 3,4
B. 6,8
C. 6,9
D. 4,3
[单项选择]有以下程序
#include <iostream>
using namespace std;
class sample
private:
int x;
public:
sample(int a)
x=a;
friend double square(sample s);
;
double square(sample s)
return s.x*s.x;
int main( )
sample s1 (20),s2(30);
cout<<square(s2)<<end1;
return 0;
执行结果是()
A. 20
B. 30
C. 900
D. 400