Upload files to "ex1C_summation_of_specified_numbers"

ex1C_summation_of_specified_numbers/main.cpp

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+#include "special_sum.h"
+#include "../utils/timing.h"
+#include <iostream>
+#include <chrono>
+#include <stack>
+using namespace std;
+
+int main(int argc, char **argv)
+{
+    // check results and compare speeds
+    for(size_t n : {15, 1001, 1432987})
+    {
+        cout << "n = " << n << endl;
+        size_t sum_1, sum_2;
+
+        tic();
+        for(size_t i = 0; i < 1000; ++i)
+            sum_1 = special_sum_loop(n);
+        double time_1 = toc();
+
+        tic();
+        for(size_t i = 0; i < 1000; ++i)
+            sum_2 = special_sum_noloop(n);
+        double time_2 = toc();
+            
+        cout << "loop: " << sum_1 << "\t\tDuration: " << time_1 << endl;
+        cout << "no loop: " << sum_2 << "\t\tDuration: " << time_2 << endl << "---------------------------------------------------" << endl;
+    }
+
+    return 0;
+}