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ex1B_data-IO_and_vectors/main.cpp

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+#include "../ex1A_mean_values/means.h"
+#include <iostream>
+#include <fstream>
+#include <cmath>
+#include <vector>
+#include <algorithm>
+using namespace std;
+
+
+int main(int argc, char **argv)
+{
+    // read vector from file
+    vector<int> data_vector = {};
+
+    ifstream input_stream("data_1.txt"); 
+
+    int line;
+    while(input_stream >> line)
+    {
+        data_vector.push_back(line);
+    }
+    data_vector.shrink_to_fit();
+
+
+    // calculate minimum and maximum
+    vector<int>::iterator min_it = min_element(data_vector.begin(), data_vector.end());
+    vector<int>::iterator max_it = max_element(data_vector.begin(), data_vector.end());
+
+    // calculate arithmetic mean, geometric mean and harmonic mean
+    double am, gm, hm;
+    calculate_means(data_vector, am, gm, hm);
+
+
+    // calculate standard deviation
+    double sd = 0.;
+    int n = data_vector.size();
+    for (int i = 0; i < n; ++i)
+    {
+        sd += pow(data_vector[i] - am, 2);
+    }
+    sd = sqrt(sd/n);
+
+
+    // print results
+    cout << "minimum: " << *min_it << endl;
+    cout << "maximum: " << *max_it << endl;
+    cout << "arithmetic mean: " << am << endl;
+    cout << "geometric mean: " << gm << endl;
+    cout << "harmonic mean: " << hm << endl;
+    cout << "standard deviation: " << sd << endl;
+
+    return 0;
+}