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C++中，设置虚基类的目的是【11】。

【参考答案】

解决二义性问题

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下列程序的输出结果是【14】。#include ＜iostream＞using namespace std;template ＜typename T＞T total (T *data) {T s = 0;while(*data) {s+=*data++;}return s; }int main(){int x[]={2,4,6,8,0,12,14,16,18};cout＜＜total(x)＜＜end1;return 0;}

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下面程序的输出结果是【15】。#include ＜iostream.h＞#include ＜math.h＞class point{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) );}void main(){point p1(1,2);point p2(5,2);cout＜＜distance(p1,p2)＜＜end1;}

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