//

// Created by 赵健 on 2021/8/17.

//

#include "ilist.h"

#include <iostream>

#include <initializer_list>

double sum(std::initializer_list<double> il);

double average(const std::initializer_list<double> &ril);

void ilist::test() {

using std::cout;

using std::endl;

cout << "List 1: sum = " << sum({2, 3, 4})

<< ", ave = " << average({2, 3, 4}) << endl;

std::initializer_list<double> dl = {1.1, 2.2, 3.3, 4.4, 5.5};

cout << "List 2: sum = " << average(dl)

<< ", ave = " << average(dl) << endl;

dl = {16.0, 25.0, 36.0, 40.0, 64.0};

cout << "List 3: sum = " << sum(dl)

<< ", ave = " << average(dl) << endl;

}

double sum(std::initializer_list<double> il) {

double tot = 0;

for (auto p = il.begin(); p != il.end(); p++) {

tot += *p;

}

return tot;

}

double average(const std::initializer_list<double> &ril) {

double tot = 0;

int n = ril.size();

double ave = 0.0;

if (n > 0) {

for (auto p = ril.begin(); p != ril.end(); p++) {

tot += *p;

}

ave = tot / n;

}

return ave;

}