若将子过程SUB中的PRIVATE X改为PRIVATE Y,则Y的输出结果为 ______。
A.5
B.11
C.8
D.3
第1题:
有以下程序#include <iostream>using namespace std:class Base{private: char c;public: Base(char n) :c(n) {} ~Base ( ) { cout<<c; }}; class Derived : public Base{private: char c;public: Derived(char n):Base (n+1),c(n) {} ~Derived() { cout<<c; }};int main(){ Derived obj('x'); return 0;} 执行后的输出结果是
A.xy
B.yx
C.x
D.y
第2题:
有以下程序: #include <iostream> #include <string> using namespace std; class Y; class X { private: int x; char *strx; public: X(int a, char *str) { x=a; strx=new char[strlen(str)+1]; strcpy(strx,str); } void show(Y &ob) ; }; class Y { private: int y; char *stry; public: Y(int b,char *str) { y=b; stry=new char[strlen(str)+1]; strcpy(stry, str); } friend void X: :show(Y &ob) ; }; void X: :show(Y &ob) { cout<<strx<<", "; cout<<ob, stry<<end1; } int main ( ) { X a(10,"X"); Y b (20, "Y"); a. show(B) ; return 0; } 执行后的输出结果是( )。
A.X,Y
B.a,b
C.X,X
D.Y,Y
第3题:
有以下程序 #include<iostream> using namespace std; class Base { private: char c; public: Base(char n):c(n){} ~Base() { cout<<c; } }; class Derived:public Base { private: char c; public: Derived(char n):Base(n+1),c(n){} ~Derived() { cout<<c; } }; int main() { Derived obj('x'); return 0; } 执行后的输出结果是
A.xy
B.yx
C.x
D.y
第4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) ; }; double distance(point a,point b) { return sqrt ((a.x-b.x)* (a.x-b.x)+(a.y-b.y)*(a.y-b.y)); } int main ( ) { point pl(1,2); point p2 (5, 2); cout<<distance (pl,p2) <<end1; return 0; } 程序运行后的输出结果是( )。
A.1
B.5
C.4
D.6
第5题:
若将程序中的&& 删除,则X,Y的输出结果为 ______。
A.0 2
B.2 4
C.6 6
D.1 3