Hi,

I'm doing the first exercise on struct. I can't figure out why it doesn't return a correct result for median. It always rounds it up... Say if I input 1 2 3 4, it returns the median == 3, not 2.5, even though it uses type double. Could you please help? Also, could you please help suggest a bit of improvement on the program? I'm learning about struct/class and this exercises asks me to practice using struct...

Code:// Exercise 8.12 #include "std_lib_facilities.h" /* Write a function that finds the smallest & the largest element of vector argument and also compute the mean and the median. Do not use global variables. Either return a struct containing results or pass them back through reference arguments. Which one do you prefer, and why? */ struct stats { vector<double> v; double smallest, largest, median; double fmean(vector<double>& v); double fmedian(vector<double>& v); double fsmallest(vector<double>& v); double flargest(vector<double>& v); }; int main() try { stats mystats; vector<double> v; double x; cout << "Enter some elements for a vector: \n"; while (cin >> x) v.push_back(x); cout << "Here are some summary statistics: \n"; cout << "Smallest: " << mystats.fsmallest(v) << '\n'; cout << "Largest: " << mystats.flargest(v) << '\n'; cout << "Mean: " << mystats.fmean(v) << '\n'; cout << "Median: " << mystats.fmedian(v) << '\n'; } catch (runtime_error e) { cout << e.what(); } double stats::fsmallest(vector<double>& v) { smallest = v[0]; for (unsigned int i = 0; i < v.size(); ++i) { if (v[i] < smallest) smallest = v[i]; } return smallest; } double stats::flargest(vector<double>& v) { largest = v[0]; for (unsigned int i = 0; i < v.size(); ++i) { if (v[i] > largest) largest = v[i]; } return largest; } double stats::fmean(vector<double>& v) { double sum = 0; for (unsigned int i = 0; i < v.size(); ++i) { sum += v[i]; } return sum / v.size(); } double stats:: fmedian(vector<double>& v) { sort(v.begin(), v.end()); median = 0; for (unsigned int i = 0; i < v.size(); ++i) { if (v.size()%2==0) median = (v[v.size()/2] + v[v.size()/2-1])/2; median = v[v.size()/2]; } return median; }