diff --git a/.gitignore b/.gitignore
index 1f0ed89..c659aea 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,4 +4,6 @@
 /lab_1.layout
 /unittest.depend
 /unittest.layout
-/curl
\ No newline at end of file
+/curl
+/lab_4.depend
+/lab_4.layout
diff --git a/histogram.cpp b/histogram.cpp
new file mode 100644
index 0000000..b261aeb
--- /dev/null
+++ b/histogram.cpp
@@ -0,0 +1,59 @@
+#include "histogram.h"
+#include <iostream>
+#include <vector>
+using namespace std;
+
+bool find_minmax( vector<double> numbers, double &min, double &max)
+{
+    if (numbers.empty())
+    {
+        return false;
+    }
+    min = numbers[0];
+    max = numbers[0];
+       for (double x : numbers)
+    {
+        max = x;
+        if (x < min)
+        {
+            min = x;
+        }
+        else if (x > max)
+        {
+            max = x;
+        }
+    }
+    return true;
+}
+
+vector<size_t> make_histogram (vector<double> numbers, size_t bin_count)
+{
+
+    double min;
+    double 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..c750551
--- /dev/null
+++ b/histogram.h
@@ -0,0 +1,6 @@
+#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/lab_4.cbp b/lab_4.cbp
new file mode 100644
index 0000000..473f2ba
--- /dev/null
+++ b/lab_4.cbp
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
+<CodeBlocks_project_file>
+	<FileVersion major="1" minor="6" />
+	<Project>
+		<Option title="lab_4" />
+		<Option pch_mode="2" />
+		<Option compiler="gcc" />
+		<Build>
+			<Target title="Debug">
+				<Option output="bin/Debug/lab_4" prefix_auto="1" extension_auto="1" />
+				<Option object_output="obj/Debug/" />
+				<Option type="1" />
+				<Option compiler="gcc" />
+				<Compiler>
+					<Add option="-g" />
+				</Compiler>
+			</Target>
+			<Target title="Release">
+				<Option output="bin/Release/lab_4" prefix_auto="1" extension_auto="1" />
+				<Option object_output="obj/Release/" />
+				<Option type="1" />
+				<Option compiler="gcc" />
+				<Compiler>
+					<Add option="-O2" />
+				</Compiler>
+				<Linker>
+					<Add option="-s" />
+				</Linker>
+			</Target>
+		</Build>
+		<Compiler>
+			<Add option="-Wall" />
+			<Add option="-fexceptions" />
+		</Compiler>
+		<Unit filename="main.cpp" />
+		<Extensions>
+			<lib_finder disable_auto="1" />
+		</Extensions>
+	</Project>
+</CodeBlocks_project_file>
diff --git a/sr.cpp b/sr.cpp
new file mode 100644
index 0000000..54c4856
--- /dev/null
+++ b/sr.cpp
@@ -0,0 +1,16 @@
+#include <math.h>
+#include <iostream>
+#include <conio.h>
+#include <vector>
+#include <string>
+
+using namespace std;
+
+double sr(const vector<size_t>& bins) {
+    size_t totalHeight = 0;
+    for (size_t bin : bins) {
+        totalHeight += bin;
+    }
+
+    return static_cast<double>(totalHeight) / bins.size();
+}
diff --git a/sr.h b/sr.h
new file mode 100644
index 0000000..fa59a19
--- /dev/null
+++ b/sr.h
@@ -0,0 +1,7 @@
+#ifndef SR_H_INCLUDED
+#define SR_H_INCLUDED
+#include <vector>
+
+double sr(const std::vector<size_t>& bins);
+
+#endif // SR_H_INCLUDED
diff --git a/svg.cpp b/svg.cpp
new file mode 100644
index 0000000..4edb6d8
--- /dev/null
+++ b/svg.cpp
@@ -0,0 +1,98 @@
+#include <math.h>
+#include <iostream>
+#include <conio.h>
+#include <vector>
+#include <string>
+#include "svg.h"
+//#include "sr.h"
+
+//using namespace std;
+//
+//double sr(const vector<size_t>& bins) {
+//    size_t totalHeight = 0;
+//    for (size_t bin : bins) {
+//        totalHeight += bin;
+//    }
+//
+//    return static_cast<double>(totalHeight) / bins.size();
+//}
+
+
+
+
+void
+svg_begin(double width, double height)
+{
+    cout << "<?xml version='1.0' encoding='UTF-8'?>\n";
+    cout << "<svg ";
+    cout << "width='" << width << "' ";
+    cout << "height='" << height << "' ";
+    cout << "viewBox='0 0 " << width << " " << height << "' ";
+    cout << "xmlns='http://www.w3.org/2000/svg'>\n";
+}
+
+void
+svg_end()
+{
+    cout << "</svg>\n";
+}
+
+void
+svg_text(double left, double baseline, string text)
+{
+    cout << "<text x='" << left << "' y='" << baseline << "'>" << text << "</text>";
+}
+
+void
+svg_rect(double x, double y, double width, double height, string stroke = "black", string fill = "black")
+{
+    cout << "<rect x='"<<x<<"' y='"<<y<<"' width='"<<width<<"' height='"<<height<<"' stroke='"<<stroke<<"' fill='"<<fill<<"' />";
+
+}
+
+
+void
+show_histogram_svg(const vector<size_t>& bins)
+{
+    const auto IMAGE_WIDTH = 400;
+    const auto IMAGE_HEIGHT = 300;
+    const auto TEXT_LEFT = 20;
+    const auto TEXT_BASELINE = 20;
+    const auto TEXT_WIDTH = 50;
+    const auto BIN_HEIGHT = 30;
+    const auto BLOCK_WIDTH = 10;
+    const auto BLACK = "black";
+    const auto RED = "red";
+    const auto GREEN = "green";
+    const auto MAX_WIDTH = IMAGE_WIDTH-TEXT_WIDTH;
+
+    size_t x = sr(bins);
+
+    svg_begin(IMAGE_WIDTH,IMAGE_HEIGHT);
+
+    double top = 0;
+    double max_count = bins[0];
+    for (size_t i = 0; i < bins.size(); i++)
+    {
+        if (max_count<bins[i])
+        {
+            max_count=bins[i];
+        }
+    }
+
+    for (size_t bin : bins)
+    {
+        double bin_width = (MAX_WIDTH)*(bin/max_count);
+        svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
+        if (bin_width<=MAX_WIDTH/max_count*x)
+        {
+            svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, BLACK, GREEN);
+        }
+        else{
+        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, BLACK, RED);
+        }
+        top += BIN_HEIGHT;
+    }
+
+    svg_end();
+}
diff --git a/svg.h b/svg.h
new file mode 100644
index 0000000..af68030
--- /dev/null
+++ b/svg.h
@@ -0,0 +1,8 @@
+#ifndef SVG_H_INCLUDED
+#define SVG_H_INCLUDED
+#include <vector>
+
+void
+show_histogram_svg(const std::vector<size_t>& bins);
+
+#endif // SVG_H_INCLUDED
diff --git a/text.cpp b/text.cpp
new file mode 100644
index 0000000..5ae4546
--- /dev/null
+++ b/text.cpp
@@ -0,0 +1,53 @@
+#include <iostream>
+#include <vector>
+#include "text.h"
+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;
+    size_t i,j;
+    double max_count;
+    max_count = bins[0];
+    for (i=0; i< bin_count; i++)
+    {
+        if (max_count<bins[i])
+        {
+            max_count=bins[i];
+        }
+    }
+
+    size_t height;
+    bool flag = false;
+    if(max_count>max_asterisk)
+    {
+        flag=true;
+    }
+    for (j = 0; j < bin_count; j++)
+    {
+        if (bins[j] < 100)
+        {
+            cout << " ";
+        }
+        if (bins[j] < 10)
+        {
+            cout << " ";
+        }
+        cout << bins[j] << "|";
+
+        if (flag)
+        {
+            height = max_asterisk * (static_cast<double>(bins[j]) / max_count);
+        }
+        else
+        {
+            height=bins[j];
+        }
+        for (i = 0; i < height; i++)
+        {
+            cout << "*";
+        }
+        cout << endl;
+    }
+}
diff --git a/text.h b/text.h
new file mode 100644
index 0000000..bd0f200
--- /dev/null
+++ b/text.h
@@ -0,0 +1,7 @@
+#ifndef TEXT_H_INCLUDED
+#define TEXT_H_INCLUDED
+
+void
+show_histogram_text(std::vector<size_t> bins, size_t bin_count);
+
+#endif // TEXT_H_INCLUDED