有以下程序: #include<iostrearn> using namespace std; class sample { private: int x; static int y; public: sample (int A) ; static void print (sample s); }; sample::sample(int A) { x=a; y+=x; }
A.x=10,y=20
B.x=20,y=30
C.x=30,y=20
D.x=30,y=30
第1题:
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
第2题:
有以下程序: #include<iostream> using namespace std; class A { private: int x; public: A(int a) { x=a; } friend class B; }; class B { public: void print(A a) { a.x--; cout<<a, x<<end1; } }; int main () { A a(10); B b; b.print (a) ; return 0; } 程序执行后的输出结果是( )。
A.9
B.10
C.11
D.12
第3题:
有以下程序:
include <iostream>
using namespace std;
class sample
{
int x;
public:
void setx(int i)
{
x=i;
}
int putx ()
{
return x;
}
};
int main ( )
{
sample *p;
sample A[3];
A[0] .set>:(5);
A[1] .setx(6);
A[2] .setx(7);
for (int j=0;j<3;j++)
{
p=&A[j];
cout<<p->putx () <<", ";
}
cout<<end1;
return 0;
}
执行后的输出结果是【 】。
第4题:
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.K; } int main() { sa
A.20
B.30
C.900
D.400
第5题:
若有以下程序: #include<iostream> using namespace std; class sample { private: int n; public: sample(){} sample(int m) { n=m; } void addvalue(int m) { sample s; s.n=n+m; *this=s; } void disp() { cout<<"n"=<<n<<end1; } }; int main() { sample s(10); s.addvalue(5); s.disp(); return 0; } 程序运行后的输出结果是
A.n=10
B.n=5
C.n=15
D.n=20
第6题:
有如下程序: #include <iostream> using namespace std; class sample { private: int x,y; public: sample(int i,int j) { x=i; y=j; } void disp () { cout<<"disp1"<<end1; } void disp() const { cout<<"disp2"<<end1; };int main () { const sample a(1,2); a.disp(); return 0; } 该程序运行后的输出结果是
A.disp1
B.disp2
C.disp1 disp2
D.程序编译时出错
第7题:
以下程序的执行结果是 ( )。 #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) {
A.20
B.30
C.900
D.400
第8题:
若有以下程序: #include <iostream> using namespace std; class sample { private: int x; public: sample() { } void setx(int i) { x=i; } friend int fun(sample B[],int n) { int m=O; for (int i=O; i<n; i++) { if(B[i].x>m) m=B [i].x; } return m; } }; int main ( ) { sample A[10]; int arr[]={90,87,42,78,97,84,60,55,78,65}; for (int i=O;i<10;i++) A[i]. setx (arr[i]); cout<<fun(A, 10)<<end1; return 0; } 该程序运行后的输出结果是( )。
A.97
B.84
C.90
D.78
第9题:
若有如下程序: #include<iostream> using namespace std; int s=O; class sample { static int n; public: sample(int i) { n=i; } static void add() { s+=n; } }; int sample::s=0; int main() { sample a(2),b(5); sample::add(); cout<<S<<end1; return 0; } 程序运行后的输出结果是
A.2
B.5
C.7
D.3
第10题:
有以下程序: #include<iostream> using namespace std; #definePl 3.14 Class Point {private: int x,y; public: Point(int a,intB) {X=a; y:b;} int getx() <return x;} int gety() {return y;}}; class Circle:public Point {pri
A.314
B.157
C.78.5
D.153.86