diff --git a/histogram.cpp b/histogram.cpp
new file mode 100644
index 0000000..6d3c205
--- /dev/null
+++ b/histogram.cpp
@@ -0,0 +1,53 @@
+#include "histogram.h"
+#include <vector>
+#include "histogram_internal.h"
+
+using namespace std;
+void find_minmax(const vector<double>& numbers, double& minp, double& maxp)
+{
+    minp = numbers[0];
+    for (auto i = 0; i<numbers.size(); i++)
+    {
+        if (numbers[i]<minp)
+        {
+            minp = numbers[i];
+        }
+    }
+
+    maxp = numbers[0];
+    for (auto i = 0; i<numbers.size(); i++)
+    {
+        if (numbers[i]>maxp)
+        {
+            maxp = numbers[i];
+        }
+    }
+}
+
+vector <size_t> make_histogram (const vector<double>& numbers, size_t kol_kor)
+{
+    vector<size_t>B(kol_kor);
+    size_t max_count;
+    double maxp, minp;
+    find_minmax(numbers, minp, maxp);
+    double step = (maxp-minp)/(kol_kor);
+
+    for (size_t i=0; i<numbers.size(); i++)
+    {
+        for (size_t j=0; j<kol_kor; j++)
+        {
+            if ((numbers[i]>=(minp+j*step))&&(numbers[i]<(minp+(j+1)*step)))
+            {
+                B[j]++;
+                break;
+            }
+        }
+    }
+
+    for (size_t i=0; i<numbers.size(); i++)
+    {
+        if (numbers[i]== maxp)
+            B[kol_kor-1]++;
+    }
+    return B;
+}