пункт 5. добавила формат SVG

histogram.cpp

@@ -0,0 +1,46 @@
+#include "histogram.h"
+#include <vector>
+
+void
+find_minmax(const std::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;
+        }
+    }
+}
+
+std::vector<size_t>
+make_histogram(const std::vector<double>& numbers, size_t bin_count) {
+    std::vector<size_t> bins(bin_count, 0);
+
+    double min, max;
+    find_minmax(numbers, min, max);
+
+    double bin_size = (max - min) / bin_count;
+    if (bin_size == 0) {
+        bin_size = 1;
+    }
+
+    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;
+}

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

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 // HISTOGRAM_INTERNAL_H_INCLUDED

main.cpp

@@ -1,85 +1,40 @@
 #include <iostream>
 #include <vector>
+#include "histogram.h"
+#include "text.h"
+#include "svg.h"
 using namespace std;
 
-int main()
-{
-    size_t number_count, bin_count;
-    const size_t SCREEN_WIDTH = 80;
-    const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
+struct Input {
+    vector<double> numbers;
+    size_t bin_count{};
+};
 
+Input
+input_data() {
+    cerr << "Enter number count, numbers and bin count: ";
 
-    cerr << "Enter number count: ";
+    size_t number_count;
     cin >> number_count;
 
-    vector<double> numbers(number_count);
+    Input in;
+    in.numbers.resize(number_count);
 
-    cerr <<"Enter the numbers: ";
-    for (size_t i=0; i< number_count; i++) {
-        cin >> numbers[i];
+    for (size_t i = 0; i < number_count; i++) {
+        cin >> in.numbers[i];
     }
-    cerr << "Enter bin count: ";
-    cin >> bin_count;
-
-    vector<size_t> bins(bin_count);
-
-    double min = numbers[0];
-    double max = numbers[0];
-        for (double x : numbers) {
-            if (x < min) {
-                min = x;
-            }
-            else if (x > max) {
-                max = x;
-            }
-        }
 
-    double bin_size = (max - min) / bin_count;
+    cin >> in.bin_count;
 
-    size_t max_count = 0;
-
-    for (size_t i = 0; i < number_count; 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]++;
-            if (bins[j] > max_count) {
-                    max_count = bins[j];
-                }
-            found = true;
-        }
-    }
-      if (!found) {
-        bins[bin_count - 1]++;
-         if (bins[bin_count - 1] > max_count) {
-                max_count = bins[bin_count - 1];
-            }
-    }
+    return in;
 }
- for (size_t i = 0; i < bin_count; i++) {
-        size_t height = 0;
 
-        if (max_count > MAX_ASTERISK) {
-            height = static_cast<size_t>(MAX_ASTERISK * static_cast<double>(bins[i]) / max_count);
-        }
-         else {
-            height = bins[i];
-        }
-       if (bins[i] < 10) {
-            cout << "  " << bins[i] << "|";
-        } else if (bins[i] < 100) {
-            cout << " " << bins[i] << "|";
-        } else {
-            cout << bins[i] << "|";
-        }
-        for (size_t j = 0; j < height; j++) {
-            cout << "*";
-        }
-        cout << endl;
-    }
 
+int
+main() {
+    auto in = input_data();
+    auto bins = make_histogram(in.numbers, in.bin_count);
+    show_histogram_svg(bins);
 
-    }
-
+    return 0;
+}

svg.cpp

@@ -0,0 +1,58 @@
+#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 ";
+    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, const 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;
+
+    svg_begin(IMAGE_WIDTH, IMAGE_HEIGHT);
+
+    double top = 0;
+    size_t max_bin = 0;
+    for (size_t i = 0; i < bins.size(); ++i) {
+        if (bins[i] > max_bin) {
+            max_bin = bins[i];
+        }
+    }
+    double scale = (max_bin > 0) ? (IMAGE_WIDTH - TEXT_WIDTH) * 1.0 / max_bin : 0;
+
+    for (size_t bin : bins) {
+        const double bin_width = scale * bin;
+        svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
+        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT);
+        top += BIN_HEIGHT;
+    }
+
+    svg_end();
+}

svg.h

@@ -0,0 +1,10 @@
+#ifndef SVG_H_INCLUDED
+#define SVG_H_INCLUDED
+
+#include <vector>
+
+void svg_begin(double width, double height);
+void svg_end();
+void show_histogram_svg(const std::vector<size_t>& bins);
+
+#endif // SVG_H_INCLUDED

text.cpp

@@ -0,0 +1,39 @@
+#include "text.h"
+#include <iostream>
+
+void
+show_histogram_text(const std::vector<size_t>& bins, size_t screen_width) {
+    const size_t MAX_ASTERISK = screen_width - 3 - 1;
+
+    size_t max_count = 0;
+    for (size_t count : bins) {
+        if (count > max_count) {
+            max_count = count;
+        }
+    }
+
+    for (size_t i = 0; i < bins.size(); i++) {
+        size_t height = 0;
+
+        if (max_count > MAX_ASTERISK) {
+            height = static_cast<size_t>(
+                MAX_ASTERISK * static_cast<double>(bins[i]) / max_count
+            );
+        } else {
+            height = bins[i];
+        }
+
+        if (bins[i] < 10) {
+            std::cout << "  " << bins[i] << "|";
+        } else if (bins[i] < 100) {
+            std::cout << " " << bins[i] << "|";
+        } else {
+            std::cout << bins[i] << "|";
+        }
+
+        for (size_t j = 0; j < height; j++) {
+            std::cout << "*";
+        }
+        std::cout << std::endl;
+    }
+}

text.h

@@ -0,0 +1,8 @@
+#ifndef TEXT_H_INCLUDED
+#define TEXT_H_INCLUDED
+
+#include <vector>
+
+void show_histogram_text(const std::vector<size_t>& bins, size_t screen_width = 80);
+
+#endif // TEXT_H_INCLUDED

unittest.cbp

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
+<CodeBlocks_project_file>
+	<FileVersion major="1" minor="6" />
+	<Project>
+		<Option title="unittest" />
+		<Option pch_mode="2" />
+		<Option compiler="gcc" />
+		<Build>
+			<Target title="Debug">
+				<Option output="bin/Debug/unittest" 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/unittest" 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" />
+		</Compiler>
+		<Extensions>
+			<lib_finder disable_auto="1" />
+		</Extensions>
+	</Project>
+</CodeBlocks_project_file>

unittest.cpp

@@ -0,0 +1,36 @@
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "doctest.h"
+#include "histogram_internal.h"
+#include <vector>
+
+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("find_minmax with one element") {
+    std::vector<double> numbers{42};
+    double min, max;
+    find_minmax(numbers, min, max);
+    CHECK(min == 42);
+    CHECK(max == 42);
+}
+
+TEST_CASE("find_minmax with negative values") {
+    std::vector<double> numbers{-10.5, -2.3, -3.3};
+    double min, max;
+    find_minmax(numbers, min, max);
+    CHECK(min == -10.5);
+    CHECK(max == -2.3);
+}
+
+TEST_CASE("find_minmax with identical elements") {
+    std::vector<double> numbers{7, 7, 7, 7};
+    double min, max;
+    find_minmax(numbers, min, max);
+    CHECK(min == 7);
+    CHECK(max == 7);
+}