diff --git a/histogram.cpp b/histogram.cpp
new file mode 100644
index 0000000..cf9f108
--- /dev/null
+++ b/histogram.cpp
@@ -0,0 +1,32 @@
+#include "histogram.h"
+#include "histogram_internal.h"
+#include <vector>
+#include <cstddef>
+
+using namespace std;
+
+void find_minmax(const vector<double>& numbers, double& min, double& max) {
+    if (numbers.empty()) {
+        return;
+    }
+    min = numbers[0];
+    max = numbers[0];
+
+    for (double x : numbers) {
+        if (x < min) min = x;
+        if (x > max) max = x;
+    }
+}
+
+vector<size_t> make_histogram(const vector<double>& numbers, size_t bin_count) {
+    double min, max;
+    find_minmax(numbers, min, max);
+
+    vector<size_t> bins(bin_count);
+    for (double x : numbers) {
+        size_t bin_index = (x - min) / (max - min) * bin_count;
+        if (bin_index == bin_count) bin_index--;
+        bins[bin_index]++;
+    }
+    return bins;
+}
diff --git a/histogram.h b/histogram.h
new file mode 100644
index 0000000..8f0e098
--- /dev/null
+++ b/histogram.h
@@ -0,0 +1,9 @@
+#ifndef HISTOGRAM_H_INCLUDED
+#define HISTOGRAM_H_INCLUDED
+
+#include <vector>
+#include <cstddef>
+
+std::vector<size_t> make_histogram(const std::vector<double>& numbers, size_t bin_count);
+
+#endif
diff --git a/histogram_internal.h b/histogram_internal.h
new file mode 100644
index 0000000..177657b
--- /dev/null
+++ b/histogram_internal.h
@@ -0,0 +1,8 @@
+#ifndef HISTOGRAM_INTERNAL_H_INCLUDED
+#define HISTOGRAM_INTERNAL_H_INCLUDED
+
+#include <vector>
+
+void find_minmax(const std::vector<double>& numbers, double& min, double& max);
+
+#endif
diff --git a/svg.cpp b/svg.cpp
new file mode 100644
index 0000000..39e5180
--- /dev/null
+++ b/svg.cpp
@@ -0,0 +1,45 @@
+#include "svg.h"
+#include <iostream>
+#include <vector>
+#include <string>
+
+using namespace std;
+
+void svg_begin(double width, double height) {
+    cout << "<?xml version='1.0' encoding='UTF-8'?>\n";
+    cout << "<svg width='" << width << "' height='" << height << "' viewBox='0 0 " << width << " " << height << "' 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>\n";
+}
+
+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 << "'/>\n";
+}
+
+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;
+
+    svg_begin(IMAGE_WIDTH, IMAGE_HEIGHT);
+
+    double top = 0;
+    for (size_t bin : bins) {
+        const double bin_width = BLOCK_WIDTH * bin;
+        svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
+        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, "red", "#ffeeee");
+        top += BIN_HEIGHT;
+    }
+
+    svg_end();
+}
diff --git a/svg.h b/svg.h
new file mode 100644
index 0000000..b82c7e1
--- /dev/null
+++ b/svg.h
@@ -0,0 +1,9 @@
+#ifndef SVG_H_INCLUDED
+#define SVG_H_INCLUDED
+
+#include <vector>
+#include <cstddef>
+
+void show_histogram_svg(const std::vector<size_t>& bins);
+
+#endif
diff --git a/text.cpp b/text.cpp
new file mode 100644
index 0000000..91a6cb8
--- /dev/null
+++ b/text.cpp
@@ -0,0 +1,22 @@
+#include "text.h"
+#include <iostream>
+#include <vector>
+#include <cstddef>
+
+using namespace std;
+
+void show_histogram_text(const vector<size_t>& bins) {
+    const size_t SCREEN_WIDTH = 80;
+    size_t max_count = 0;
+    for (size_t count : bins) {
+        if (count > max_count) max_count = count;
+    }
+
+    for (size_t bin : bins) {
+        size_t height = bin * SCREEN_WIDTH / max_count;
+        for (size_t i = 0; i < height; i++) {
+            cout << '*';
+        }
+        cout << endl;
+    }
+}
diff --git a/text.h b/text.h
new file mode 100644
index 0000000..ba4704d
--- /dev/null
+++ b/text.h
@@ -0,0 +1,9 @@
+#ifndef TEXT_H_INCLUDED
+#define TEXT_H_INCLUDED
+
+#include <vector>
+#include <cstddef>
+
+void show_histogram_text(const std::vector<size_t>& bins);
+
+#endif // TEXT_H_INCLUDED