diff --git a/histogram.cpp b/histogram.cpp
new file mode 100644
index 0000000..bd8cadf
--- /dev/null
+++ b/histogram.cpp
@@ -0,0 +1,35 @@
+#include "histogram.h"
+#include <vector>
+using namespace std;
+
+static void find_minmax(const vector<double>& numbers, double& min, double& max) {
+    max = numbers[0];
+    min = numbers[1];
+    for (double x : numbers) {
+        if (x < min) min = x;
+        else if (x > max) max = x;
+    }
+}
+
+vector<size_t> make_histogram(vector<double> numbers, size_t bin_count) {
+    double min, max;
+    find_minmax(numbers, min, max);
+    double bin_size = (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 * 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..1ee7f4d
--- /dev/null
+++ b/histogram.h
@@ -0,0 +1,9 @@
+#ifndef HISTOGRAM_H_INCLUDED
+#define HISTOGRAM_H_INCLUDED
+
+#include <vector>
+using namespace std;
+
+vector<size_t> make_histogram(vector<double> numbers, size_t bin_count);
+
+#endif
diff --git a/main.cpp b/main.cpp
index bc6780d..1457c4c 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,123 +1,34 @@
 #include <iostream>
 #include <vector>
-
+#include "histogram.h"
+#include "text.h"
 using namespace std;
 
 struct Input {
     vector<double> numbers;
-    size_t bin_count{};
+    size_t bin_count;
 };
 
-Input input_data(){
-    size_t number_count, bin_count;
+Input input_data() {
+    Input in;
+    size_t number_count;
     cerr << "Enter number count: ";
     cin >> number_count;
-    Input in;
-    in.numbers.resize(number_count);
 
-    for (size_t i = 0; i < number_count; i++)
-    {
-        cerr << "Enter Num[" << i << "]: ";
+    in.numbers.resize(number_count);
+    cerr << "Enter numbers: ";
+    for (size_t i = 0; i < number_count; i++) {
         cin >> in.numbers[i];
     }
+
     cerr << "Enter bin count: ";
     cin >> in.bin_count;
     return in;
 }
 
-void find_minmax(const vector<double> &numbers, double &min, double &max)
-{
-    max = numbers[0];
-    min = numbers[1];
-    for (double x: numbers)
-    {
-        if (x < min)
-        {
-            min = x;
-        }
-        else if (x > max)
-        {
-            max = x;
-        }
-    }
-    return;
-}
-
-vector<size_t> make_histogram (vector<double> numbers, size_t bin_count)
-{
-    double min, max;
-    find_minmax (numbers, min, max);
-    double bin_size = (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 * 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(vector<size_t> bins, size_t bin_count)
-{
-    const size_t SCREEN_WIDTH = 80;
-    const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
-    double max_bin;
-    size_t height;
-    max_bin = bins[0];
-    height = bins[0];
-    for (size_t i = 0; i < bin_count; i++)
-    {
-        if (bins[i] > max_bin){
-            max_bin = bins[i];
-        }
-    }
-
-    bool flag = false;
-    if ( max_bin > 80)
-    {
-        flag = true;
-    }
-    for (size_t i = 0; i < bin_count; i++)
-    {
-        if (bins[i] < 100)
-            cout << " ";
-        if (bins[i] < 10)
-            cout << " ";
-        cout << bins[i] << "|";
-        if( flag == true)
-        {
-            height = MAX_ASTERISK * (static_cast<double>(bins[i]) / max_bin);
-        }
-        else
-        {
-            height = bins[i];
-        }
-        for (size_t j = 0; j < height; j++)
-        {
-            cout << "*";
-        }
-        cout << endl;
-    }
-}
-
-int main()
-{
+int main() {
     auto in = input_data();
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_text(bins, in.bin_count);
     return 0;
 }
-
diff --git a/text.cpp b/text.cpp
new file mode 100644
index 0000000..9f8573c
--- /dev/null
+++ b/text.cpp
@@ -0,0 +1,37 @@
+#include "text.h"
+#include <iostream>
+using namespace std;
+
+void show_histogram_text(vector<size_t> bins, size_t bin_count) {
+    const size_t SCREEN_WIDTH = 80;
+    const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
+    double max_bin;
+    size_t height;
+    max_bin = bins[0];
+    height = bins[0];
+    for (size_t i = 0; i < bin_count; i++) {
+        if (bins[i] > max_bin) {
+            max_bin = bins[i];
+        }
+    }
+
+    bool flag = false;
+    if (max_bin > 80) {
+        flag = true;
+    }
+    for (size_t i = 0; i < bin_count; i++) {
+        if (bins[i] < 100) cout << " ";
+        if (bins[i] < 10) cout << " ";
+        cout << bins[i] << "|";
+        if (flag == true) {
+            height = MAX_ASTERISK * (static_cast<double>(bins[i]) / max_bin);
+        }
+        else {
+            height = bins[i];
+        }
+        for (size_t j = 0; j < height; j++) {
+            cout << "*";
+        }
+        cout << endl;
+    }
+}
diff --git a/text.h b/text.h
new file mode 100644
index 0000000..f5c2730
--- /dev/null
+++ b/text.h
@@ -0,0 +1,9 @@
+#ifndef TEXT_H_INCLUDED
+#define TEXT_H_INCLUDED
+
+#include <vector>
+using namespace std;
+
+void show_histogram_text(vector<size_t> bins, size_t bin_count);
+
+#endif