Exercise 2, Sheet 1

mainEx2.cpp

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+#include <iostream>
+#include <fstream>
+#include <vector>
+#include <cmath>
+#include <algorithm>
+using namespace std;
+
+int main() {
+    vector<double> data;
+    double x;
+
+    ifstream infile("data_1.txt");
+    while (infile >> x) { //>> takes things from an input and saves as x
+        data.push_back(x); //saves each x in data
+    }
+    infile.close();
+    
+    int n = data.size();
+
+    double minVal = *min_element(data.begin(), data.end());
+    double maxVal = *max_element(data.begin(), data.end());
+
+    double sum = 0.0, logSum = 0.0, recipSum = 0.0;
+    for (int i = 0; i < n; ++i) { //for (initialization; condition; update)
+        sum += data[i];
+        logSum += log(data[i]);
+        recipSum += 1.0 / data[i];
+    }
+    double arith = sum / n;
+    double geom  = exp(logSum / n);
+    double harm  = n / recipSum;
+
+    // standard deviation
+    double variance = 0.0;
+    for (int i = 0; i < n; ++i) {
+        variance += (data[i] - arith) * (data[i] - arith);
+    }
+    double stdev = sqrt(variance / n);
+
+    ofstream outfile("out_1.txt");
+    outfile << "Minimum: " << minVal << endl;
+    outfile << "Maximum: " << maxVal << endl;
+    outfile << "Arithmetic mean: " << arith << endl;
+    outfile << "Geometric mean:  " << geom << endl;
+    outfile << "Harmonic mean:   " << harm << endl;
+    outfile << "Standard deviation: " << stdev << endl;
+    outfile.close();
+
+    return 0;
+}