diff --git a/.gitignore b/.gitignore
index 4517317..0a7cf4e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,5 @@
 /lab01.layout
 /lab01.depend
 /main.exe
-/main.o
\ No newline at end of file
+/main.o
+/bat
\ No newline at end of file
diff --git a/histogram.cpp b/histogram.cpp
new file mode 100644
index 0000000..857de96
--- /dev/null
+++ b/histogram.cpp
@@ -0,0 +1,43 @@
+#include <vector>
+#include "histogram.h"
+
+using namespace std;
+
+void find_minmax(const vector<double> &numbers, double &min, double &max){
+    min = numbers[0];
+    max = numbers[0];
+    for (double x : numbers) {
+        if (x < min) {
+            min = x;
+        }
+        else if (x > max) {
+            max = x;
+        }
+    }
+}
+
+vector<size_t> make_histogram(const vector<double> &numbers, size_t bin_count){
+    vector<size_t> bins ( bin_count );
+    double min = numbers[0];
+    double max = numbers[0];
+
+    find_minmax(numbers, min, max);
+
+    double bin_size = (max - min) / 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 * bin_size;
+            auto hi = min + (j + 1) * bin_size;
+            if ((lo <= numbers[i]) && (numbers[i] < hi)) {
+                bins[j]++;
+                found = true;
+            }
+        }
+        if (!found) {
+            bins[bin_count - 1]++;
+        }
+    }
+    return bins;
+}
diff --git a/histogram.h b/histogram.h
new file mode 100644
index 0000000..0d8dc8c
--- /dev/null
+++ b/histogram.h
@@ -0,0 +1,9 @@
+#ifndef HISTOGRAM_H_INCLUDED
+#define HISTOGRAM_H_INCLUDED
+
+#include <vector>
+
+std::vector<size_t>
+make_histogram(const std::vector<double>& numbers, size_t bin_count);
+
+#endif // HISTOGRAM_H_INCLUDED
diff --git a/main.cpp b/main.cpp
index efb3235..4550c63 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,5 +1,6 @@
 #include <iostream>
 #include <vector>
+#include "histogram.h"
 
 using namespace std;
 
@@ -31,45 +32,6 @@ Input input_data() {
     return in;
 };
 
-void find_minmax(const vector<double> &numbers, double &min, double &max){
-    min = numbers[0];
-    max = numbers[0];
-    for (double x : numbers) {
-        if (x < min) {
-            min = x;
-        }
-        else if (x > max) {
-            max = x;
-        }
-    }
-}
-
-vector<size_t> make_histogram(const vector<double> &numbers, size_t bin_count){
-    vector<size_t> bins ( bin_count );
-    double min = numbers[0];
-    double max = numbers[0];
-
-    find_minmax(numbers, min, max);
-
-    double bin_size = (max - min) / 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 * bin_size;
-            auto hi = min + (j + 1) * bin_size;
-            if ((lo <= numbers[i]) && (numbers[i] < hi)) {
-                bins[j]++;
-                found = true;
-            }
-        }
-        if (!found) {
-            bins[bin_count - 1]++;
-        }
-    }
-    return bins;
-}
-
 void show_histogram_text(const vector<size_t> &bins){
     size_t maxbin = bins[0];
     for (size_t i=1; i < bins.size(); i++){