diff --git a/histogram.cpp b/histogram.cpp
new file mode 100644
index 0000000..0b25335
--- /dev/null
+++ b/histogram.cpp
@@ -0,0 +1,41 @@
+#include "histogram.h"
+#include "histogram_internal.h"
+bool find_minmax(vector<double> vec, double& min, double& max) {
+    if(vec.size() == 0){
+        return false;
+    }
+        min = vec[0];
+        max = vec[0];
+        for (double x : vec) {
+            if (x < min) {
+                min = x;
+            }
+            else if (x > max)
+            {
+                max = x;
+            }
+        }
+    return true;
+}
+vector<size_t> make_histogram(size_t number, vector<double> vec) {
+    vector<size_t> bins(number);
+    double mn, mx;
+    find_minmax(vec, mn, mx);
+    float bin_size = (mx - mn) / number;
+    for (size_t i = 0; i < vec.size(); i++) {
+        bool fl = false;
+        for (size_t j = 0; (j < number - 1) && !fl; j++) {
+            auto lo = mn + j * bin_size;
+            auto hi = mn + (j + 1) * bin_size;
+            if ((lo <= vec[i]) && (vec[i] < hi)) {
+                bins[j]++;
+                fl = true;
+            }
+        }
+        if (!fl) {
+            bins[number - 1]++;
+
+        }
+    }
+    return bins;
+}
diff --git a/histogram_internal.h b/histogram_internal.h
new file mode 100644
index 0000000..6631db5
--- /dev/null
+++ b/histogram_internal.h
@@ -0,0 +1 @@
+bool find_minmax(const std::vector<double> vec, double& min, double& max);
diff --git a/svg.cpp b/svg.cpp
new file mode 100644
index 0000000..f763352
--- /dev/null
+++ b/svg.cpp
@@ -0,0 +1,77 @@
+#include "svg.h"
+
+using namespace std;
+
+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 MAX_WIDTH = IMAGE_WIDTH-TEXT_WIDTH;
+
+
+    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)
+    {
+        const auto RED = "#" + std::to_string(int(ceil(10 - (bin * 9) / max_count))) + std::to_string(int(ceil(10 - (bin * 9) / max_count))) + std::to_string(int(ceil(10 - (bin * 9) / max_count)));
+        double bin_width = (MAX_WIDTH)*(bin/max_count);
+        svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
+        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..bf136ac
--- /dev/null
+++ b/svg.h
@@ -0,0 +1,6 @@
+#include <iostream>
+#include <vector>
+#include <string>
+#include <math.h>
+using namespace std;
+void show_histogram_svg(const vector<size_t>& bins);
diff --git a/text.cpp b/text.cpp
new file mode 100644
index 0000000..03aa0c5
--- /dev/null
+++ b/text.cpp
@@ -0,0 +1,44 @@
+#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 max_bin = bins[0];
+    for(size_t i = 0; i < bin_count; i++)
+    {
+        if(bins[i] > max_bin)
+        {
+            max_bin = bins[i];
+        }
+    }
+
+    for (size_t bin: bins)
+    {
+        size_t height = bin;
+
+        if (max_bin > MAX_ASTERISK)
+        {
+          height = MAX_ASTERISK * (static_cast<double>(bin) / max_bin);
+        }
+
+        if (bin < 100)
+        {
+            cout << ' ';
+        }
+        if (bin < 10)
+        {
+            cout << ' ';
+        }
+        cout << bin << "|";
+        for(size_t i = 0; i < height; i++)
+        {
+            cout << "*";
+        }
+        cout << endl;
+    }
+}
diff --git a/unittest.cpp b/unittest.cpp
new file mode 100644
index 0000000..ad48da0
--- /dev/null
+++ b/unittest.cpp
@@ -0,0 +1,37 @@
+#define DOCTEST_CONFIG_NO_MULTITHREADING
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "doctest.h"
+#include "histogram_internal.h"
+
+TEST_CASE("distinct positive numbers") {
+    double min = 0;
+    double max = 0;
+    find_minmax({1, 2}, min, max);
+    CHECK(min == 1);
+    CHECK(max == 2);
+}
+TEST_CASE("distinct negative numbers"){
+    double min = 0;
+    double max = 0;
+    find_minmax({-1, -2}, min, max);
+    CHECK(min == -2);
+    CHECK(max == -1);
+}
+TEST_CASE("vector of the same elements"){
+    double min = 0;
+    double max = 0;
+    find_minmax({3,3,3}, min, max);
+    CHECK(min == 3);
+    CHECK(max == 3);
+}
+TEST_CASE("empty vector"){
+    double min = 0;
+    double max = 0;
+    CHECK(!find_minmax({}, min, max));
+}
+TEST_CASE("vector of one elements"){
+    double min = 0;
+    double max = 0;
+    find_minmax({3}, min, max);
+    CHECK(min == max);
+}