C++primer plus第六版课后编程题答案8.8

8.8

#include <iostream>
using namespace std;
template <typename T>
T SumArray(T arr[],int n)
{
T sum=0;
for(int i=0;i<n;i++)
sum+=arr[i];
return sum;
};
template <typename T>
T SumArray(T *arr[],int n)//arr是指向指针数组的指针
{
T sum=0;
for(int i=0;i<n;i++)
sum+=*arr[i]; //arr[i]是一个指针,+*之后才是其中的数值;
return sum;
};
struct debts{
char name[20];
double amount;
};

void main87()
{
int things[6]={13,31,103,301,310,130};
struct debts mr_E[3]={
{"Ima Wolfe",2400.0},
{"Ura Foxe",1300.0},
{"Tby Stout",1800.0}
};
double *pd[3];
for(int i=0;i<3;i++)
pd[i]=&mr_E[i].amount;//取址之后才能赋给指针

cout<<"The sum is"<<SumArray(things,6)<<endl;
cout<<"The sum is"<<SumArray(pd,3)<<endl;

}