简易统计计算器——C++版

用C++是挺方便的- -！

#include <iostream>#include <algorithm>#include <vector>using namespace std;int main(){    cout << "Please enter a series of numbers to calculate the average, "    "median and variance of them, followed by end-of-file: " << endl;    double x, sum = 0;    vector<double> num;    while (cin >> x) {        num.push_back(x);        sum += x;    }// calculate average    vector<double>::size_type size = num.size(), mid = size / 2;    double average = sum / size;// calculate median    sort(num.begin(), num.end());    double median = (size % 2 == 0) ? (num[size] + num[size-1]) / 2 : num[mid];// calculate variance    double s = 0;    for (int i = 0; i < size; i++)        s += (num[i] - average) * (num[i] - average);    s /= size;    cout << "The average: " << average << endl << "The median: " << median    << endl << "The variance: " << s << endl;    return 0;}