若有以下程序: #include <iostream> using namespace std; #define PI 3.14 class Point { private: int x,y; public: Point(int a,int b) { x=a; y=b; } int getx() { return x; } int gety() { return y; } }; class Circle : public Point { private: int r; public: Circle(int a, int b,int c) :Point(a,b) { r=c; } int getr() { return r; } double area() { return PI*r*r; } }; int main() { Circle c1(5,7,10); cout<<c1.area()<<end1; return 0; } 程序执行后的输出结果是( )。
A.314
B.157
C.78.5
D.153.86
第1题:
若有以下程序: #include <iost ream> using namespace std; class A { private: int a; public: A(int i) { a=i; } void disp () { cout<<a<<", "; } }; class B { private:
A.10,10,10
B.10,12,14
C.8,10,12
D.8,12,10
第2题:
若有以下程序: #include <iostream> using namespace std; #define PI 3.14 class Point { private: int x,y; public: Point(int a,int B) { x=a; y=b; } int getx() { return x; } int gety() { reurn y; } }; class Circle: public Point { private: int r; public: Circle(int a,int b.int C) :Point(a,B) r=c; int getr() { return r; } double area() { return PI*r*r; } }; int main() { Circle cl(5,7,10); cout<<c 1 .area()<<end1; return 0; } 程序执行后的输出结果是
A.314
B.157
C.78.5
D.153.86
第3题:
若有以下程序: #include <iostream> using namespace std; class Base { private: int x; protected: int y; public: int z; void setx(int i) { x=i; int getx () { return x; } }
A.1,2,3,4
B.产生语法错误
C.4,3,2,1
D.2,3,4,5
第4题:
若有以下程序: #include <iostream> using namespace std; class point { private: int x, y; public: point ( ) { x=0; y=0; } void setpoint(int x1,int y1) { x=x1; y=y1;
A.12,12
B.5,5
C.12,5
D.5,12
第5题:
有以下程序: #include <iostream> using namespace std; #define PI 3.14 class Point { private: int x,y; public: Point(int a,int b) { x=a; y=b; } int getx() { return x; }
A.314
B.157
C.78.5
D.153.86
第6题:
若有以下程序: #include<iostream> using namespace std; class A {private: int a; public: A(int i) {a=i;} void disp() {cout<<a<<“,”;}}; class B {private: int b; public: B(int j {b=j;} void disp() {cout<<b<<
A.10,10,10
B.10,12,14
C.8,10,12
D.8,12,10
第7题:
若有以下程序:
include <iostream>
using namespace std;
class Sample
{
private:
const int n;
public:
Sample(int i) :n(i) {)
void print()
{
cout<<"n="<<n<<end1;
}
};
int main()
{
sample a(10);
a.print();
return 0;
}
上述程序运行后的输出结果是【 】。
第8题:
有以下程序: #include<iostream> #include<math> using namespace std; class point { private: double x; double y; public: point(double a,double B) { x=a; y=b; } friend double distance (point a,point B) ;
A.1
B.5
C.4
D.6
第9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