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1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2题:
有以下程序,程序运行的结果是 ______。 #include<iostream.h> #include<string.h> void main(){ char x[]= "C++" ,y[10]= "C++" ; cout<<sizeof(x)/sizeof(char)<<“,”<<sizeof(y)/sizeof(char); }
A.3 3
B.4 4
C.4 10
D.10 10
第3题:
第4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5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