c++ primer plus 第八章《编程题8.8.7》

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本文展示了一个使用C++实现的数组求和程序实例，包括整数数组和结构体数组中特定字段的求和操作。

/*
 13 + 31 + 103 + 301 + 310 + 130 = 888
 2400.0 + 1300.0 + 1800.0 = 5500
*/
#include <iostream>

using namespace std;

struct debts {
    char name[50];
    double amount;
};
template <typename T>
const T SumArray(const T a[], int n = 6);

template <typename T>
const T SumArray(T * a[], int n = 3);


int main () {
    int things[6] = {13, 31, 103, 301, 310, 130};
    struct debts mr_E[3] = {{"Ima Wolfe", 2400.0}, {"Ura Foxe", 1300.0}, {"Iby Stout", 1800.0}};
    double * pd[3];
    for (int i = 0; i < 3; i++)
        pd[i] = &mr_E[i].amount;

    int sum = SumArray(things);
    cout << "13 + 31 + 103 + 301 + 310 + 130 = " << sum << "\n";
    double sum1 = SumArray(pd);
    cout << "2400.0 + 1300.0 + 1800.0 = " << sum1 << "\n";
}

template <typename T>
const T SumArray(const T a[], int n) {
    T sum = 0;
    for (int i = 0; i < n; i++)
        sum += a[i];

    return sum;
}

template <typename T>
const T SumArray(T * a[], int n) {
    T sum = 0;
    for (int i = 0; i < n; i++)
        sum += *a[i];

    return sum;
}