单项选择题

有以下程序
#include ＜iostream＞
using namespace std;
int a;
int fun ();
int main () extern int a;
int b;
a = 100;
b = fun();
cout＜＜b＜＜end1;
return 0;int fun) extern int a;
return (10*a ; 其程序运行后的输出结果是

A．100
B．10
C．1000
D．10000
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单项选择题
有如下程序#include ＜iostream＞using namespace std;class basepublic: virtual void f1() cout＜＜ F1Base ; virtual void f2() cout＜＜ F2Base ; ;class derive: public base void f1() cout＜＜ F1Derive ; void f2( int x ) cout＜＜ F2Derive ; ;int main() base obj1, * p; derive obj2; p = & obj2; p -＞ f1(); p -＞ f2(); return 0; 执行后的输出结果是
A．F1Derive F2Base
B．F1Derive F2Derive
C．F1Base F2Base
D．F1Base F2Derive
单项选择题
有以下程序：#include ＜iostream＞#include ＜math＞using namespace std;class pointprivate: 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. x -b. x)*(a. x-b. x));int main () point p1(1,2); point p2(5,2); cout＜＜distance (p1, p2)＜＜end1; return 0; 程序运行后的输出结果是
A．1
B．5
C．4
D．6
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