code: updated to 5

histogram.cpp

@@ -0,0 +1,60 @@
+#include <math.h>
+#include <iostream>
+#include <conio.h>
+#include <vector>
+#include "histogram.h"
+using namespace std;
+
+static
+find_minmax(vector<double> numbers, double &min, double &max)
+{
+    min = numbers[0];
+    max = numbers[0];
+    for (size_t i = 1; i < numbers.size(); i++)
+        {
+        if (min > numbers[i])
+            min = numbers[i];
+        if (max < numbers[i])
+            max = numbers[i];
+        }
+}
+
+vector <size_t> make_histogramm(vector<double>numbers, size_t bin_count)
+{
+    double min, max;
+    find_minmax(numbers, min, max);
+    double binSize = (max - min) / bin_count;
+    vector<size_t> bins(bin_count);
+    for (size_t i = 0; i < numbers.size(); i++)
+        {
+        bool found = false;
+        for (size_t j = 0; (j <= bin_count - 1) && !found; j++)
+            {
+            auto lo = min + j * binSize;
+            auto hi = min + (j + 1) * binSize;
+            if ((numbers[i] >= lo) && (numbers[i] < hi))
+                {
+                bins[j]++;
+                found = true;
+                }
+            }
+        if (!found)
+            bins[bin_count - 1]++;
+        }
+    int max_count = bins[0];
+    for (size_t i = 0; i < bin_count; i++)
+    {
+        if (bins[i] > max_count)
+            max_count = bins[i];
+    }
+    if (max_count > 76)
+    {
+        for (size_t i = 0; i < bin_count; i++)
+        {
+            int count = bins[i];
+            size_t height = 76 * (static_cast<double>(count) / max_count);
+            bins[i] = height;
+        }
+    }
+    return bins;
+}